Ha, you wouldn't offend me at all. But sure, I'll try to do what I can. I think it's more about making the map all that it can be than trying to be as historically accurate as possible. Being historically accurate is nice, but fun gameplay is even better.
I just spent the past several minutes reading up on the wiki article for the Battle of the Alamo (
http://en.wikipedia.org/wiki/Battle_of_the_Alamo). There is lots of information in there that you could use, mainly about placement of cannons and armies, plus names of commanders that you could name the bonuses after instead of a generic "Mexican Army 1", etc. Having each one named after the commander that led the attack would be a nice touch.
Here is some of the more important stuff I found.
The first night of the siege was relatively quiet.[49] Over the next few days, Mexican soldiers established artillery batteries, initially about 1,000 feet (300 m) from the south and east walls of the Alamo.[50] A third battery was positioned southeast of the fort.
Santa Anna posted one company east of the Alamo, on the road to Gonzales.[51][64] Almonte and 800 dragoons were stationed along the road to Goliad.[65]
At 10 p.m. on March 5, the Mexican artillery ceased their bombardment. As Santa Anna had anticipated, the exhausted Texians soon fell into the first uninterrupted sleep many had gotten since the siege began.[90] Just after midnight Mexican troops began preparing for the final assault.[91] The troops were divided into four columns, commanded by Cos, Colonel Francisco Duque, Colonel José María Romero and Colonel Juan Morales.[88][89] Veterans were positioned on the outside of the columns to better control the new recruits and conscripts in the middle.[92] As a precaution, 500 Mexican cavalry were positioned around the Alamo to prevent escape of either Texian or Mexican soldiers. Santa Anna remained in camp with the 400 reserves.[89][93]
At 5:30 a.m. troops silently advanced. Cos and his men approached the northwest corner of the Alamo,[92] while Duque led his men from the northwest toward a repaired breach in the Alamo's north wall.[95] The column commanded by Romero marched towards the east wall, and Morales's column aimed for the low parapet by the chapel.[95]
During the third strike, Romero's column, aiming for the east wall, was exposed to cannon fire and shifted to the north, mingling with the second column.[20] Cos's column, under fire from Texians on the west wall, also veered north.[102] When Santa Anna saw that the bulk of his army was massed against the north wall, he feared a rout; "panicked", he sent the reserves into the same area.[103]
Some pictures I found that are interesting. Can be used for cannon/army placement, etc.
This one is some game that you can play (online, I guess?). Looks interesting. Pretty useful for locations of cannons and armies (although these may not be entirely accurate, see later photos) as well as to show you the different types of walls. Notice how the Northeast and South Central portions of the wall are basically just palisade, instead of the thick walls of the rest of the mission.
I couldn't find one showing the roads around the Alamo and where they lead to, but this one shows where Goliad is in relation to the Alamo so that the information above (Almonte and 800 dragoons were stationed along the road to Goliad.) can be used as best is possible.
Here's one showing the troop movements of the first wave.
There is a lot more information in the wiki article, as well as out there on the rest of the internet. This should give you plenty of information about where to place the Mexican armies, what to name them (after their respective commanders), where to place the cannons inside the fort, etc.
Some thoughts on gameplay I had were possibly expanding the auto-deployable people from just Santa Anna and Crockett to Austin, Bowie and Crockett for the Texians, and Santa Anna, Cos, Duque, Romero and Morales for the Mexicans. That might be too much, but it could be cool to have each of the major commanders/big personalities on the map as auto-deploys to convey their significance to the fight. Bowie, might be worth it to instead of making him an auto-deploy, making him worth say a +1 or +2 to the deploy, thanks to his charisma, etc., but to have a decay on his actual terit, to signify his illness and the fact that he didn't even partake in the battle, since he was basically on his deathbed.
There is a lot more that could be done with this, too.
I'll let you mill this stuff over and post your next draft before I add any more ideas. It might be worth it to completely re-draw the map so that there is room on the eastern side of the fort, since a lot of action took place there as well, it seems. Up to you though.
Hope this helped.
(As a side note, I just realized that the attack took place on March 6, which just happens to be my birthday. Crazy stuff.)
First of, I will point you 
