the Mtech1 kit was designed for the front valance and rear apron of the prefacelift E30. sure, with some clever cutting of both the precious car AND the Mtech1 bits, of course you can have that bodykit on your plastic bumper car.
however not many gurus here will advocate you installing bits that were not meant for your car. if you wish to be somewhat different from all those fake Mtech2 cars, i suggest you consider cosmetic kits from tuners such as AC Schnitzer, Hartge, Alpina etc.. just pick a theme you like the most, and stick to it. don't go rojak unless you're Chip Foose.
at the end of the day you need to ask yourself which direction you're heading, and more importantly, why so.