The .tga's need to be changed with a program like PhotoShop or any photo editing program that surports .tga. and .bmp's. Export as a .bmp. The main .ini for the AC needs to be edited from .tga's to .bmp's also.
WeaponsData.ini and the .dat file need to be in the weapons (if you don't have one, make one and it goes in the Objects folder) folder along with the .lod's for the weapons. Basically everything for the weapons to show has to match, year, Hardpoint specs. NationName. Also the format of each weapon folder has to be converted to SF1. I haven't looked at the download, but weapons for SF2 won't work in SF1with just a copy/ past into the weapons folder. If you haven't done it, download a SF 1 weapons pack and look at the .ini's in a folder, in some weapons packs the .lod's and .ini's are not in folders, there just clumped together in one folder, but look at a .ini.