well dear i suggest you to buy a system in parts ,,,,,,,,,,,,,,,first of all the main thing compressor , i recentelly experence a pajero mino comp in cultus and it gave amazing result with zero engine load and perfect cooling , you can buy that from old parts in under 2K along with its mountain which can be fitted in place of generator and you put your generator in place of AC compressor ,,,,,,,,second thing,,,,,,,,,,condencer ,,,,,,,,,,,,,,,buy a new multi flow condencer of sucess or any other chinese/thai brand , but most of them are chinese ,,,,,,,,you can get under 3K ,,,,,,,,,,third thing ,,,,,,,,,dryer , you can buy a new one in 400Rs ,,,,,,,,,,,4th thing ,,,,,,,,,,,,,evaporator ,,,,,,,,,i suggest you batter buy a original/used one from old parts store ,,,,,,,you can get it very easily and i have no idea of its price,,,,,,,,,,,,but make it sure you flush it from inside with CTC and also service the expansion valve in it ,,,,,,,,,,,last thing are the pipe ,,,,,,,,,,the main pipes of comp suction and delievery you can buy used ,,,,,,,,,,,,rest can be hand crafted with nominal cost ,,,,,,,,,,you can even hand craft the main pipes but suggest you batter buy the main pipes in used as they will destroy your car underhood look ,,,,,,,,,,,,make sure you instal the comp in place of generator like as you see in cultus ,,,,,,,,,,,,,this will improve comp cooling ,,,,,,,,,,,,insulate all the low side pipes with foam ,,,,,,,,,,,,,,,,i am sure you will get some batter result