The only tips i have would be mark it out smaller than you would normally as the plastic bumper is very soft and easy to cut, then i used a drill with a 5mm drill bit and drilled the out line of it, then used a hand file slowly bit by bit shaped it until they fit in nice and snug, then gave them a good dose of sika flex to keep them in. They were a bit of a pain to do but got there in the end, you will also have to cut holes in the reinforcement bar aswell with a angle grinder and 1mm cutting disc.
As for the door trims, from my knowledge all R32,R33 and R34 have the same Interior trimming, except for a few little things but yeah should all be the same.