Just two small question… Is there any difference of color on the Cazadores uniforms or is it basically the same color? And which type of artillery piece would you suggest using for the Alamo period?
Senor Plynkes has covered the Cazadore uniform well with the Zaboly colour plate. Some sources say the Osprey book is not accurate(no surprises there)

. With the Mexican army anything goes, the uniforms vary from 1820's pattern tunics to the two styles worn during the 1830's. There is the double breasted style or single breasted coatee (which I have gone with).The only real important point is the green pompom and cords on the helmet to denote Cazadores.
Its probable that many of the Cazadores were equipped with the standard Brown Bess musket, not everybody was issued a Baker Rifle, so you can supplement them with basic infantry figures painted with appropriate green pompom.
Artillery pieces should be French Napoleonic Gribeauval style. The carriage would be just oiled wood, not painted and the limbers pulled by oxen. The pieces were mostly 6 or 8pdrs with several 12pdrs.
I am using Front Rank guns for mine as they fit well alongside the figures, but you could just as well use OG or Foundry guns.