i would prob play the same pre flop, thinking its better to try for a cheap set with 4 opponents is better than raising and playing for a larger pot out of position not knowing how many will call.

when the flop comes up without any high cards i figure there is a good chance i am ahead and bet the pot, not much point betting less than T100.

turn i am guessing MP2 calls on the flop with 5x (this is now unlikely), a PP or a draw, maybe 2 overcards. if he has a PP it is most prob not a high one as he could have bet by now. if he has 2 overs you need to make it unprofitable to draw. i would bet T250-300.

i would not checkraise the river, i would either make a defensive kind of bet of around 2/3-3/4 pot or check and call a modest bet.

the hands i most likely put him on are Ax Kx and any cominations of 2 picture cards.