It's a free mod.
I installed it last night and just did a couple fast quick battles (not sure if BMP is playable in the campaigns). I'm very hesitant to criticize someone's work that has made an effort to expand SABoW and of course has way more talent for this stuff then I can ever dream of. But that being said while this mod is definitely interesting it's not quite ready for prime-time, more like an alpha to be honest. Unless I got a pooched install there are a few viewable glitches, like sometimes floating crewmen (like their seat didn't render) and the view inside the BMP from certain crew positions has rectangle like areas where you can see right thru to the outside (overdone vision block maybe?). I should have taken some screenies but like I said it was just a few quick battles late last night. Other suspect areas might be the sighting scope for the ATGM's and for the BMP 73mm auto cannon as to me they looked like the same scope used by the T-62 in game. But I'm definitely no expert here so they maybe correct. My advise is to download it, try it and offer the modders some feedback. The way I see it is any new vehicle that can be added to SABoW, even if not 100% spot on is a plus for the game.
P.S. The BMP-1 73mm auto cannon has a very slow rate of fire/reload (not like SB Pro's BMP at all) Unless there's a fire rate selector switch I don't know about.