Hey sorry if this is in wrong section but i didnt know where to put it

so im thinking about getting a GMC topkick C6500 either as a pick up already or converting it to a pick up, this is going to be a huge mod, tandem rear axles, stretch the frame, custom bed, bad *** paint job etc.

im just wondering, since i've never really accessorized a truck before, what is some cool things to have, functional or not, such as chrome steps, fender flares, winch in the bumper, hood scoops, smoke stacks(actually dont look like **** on a topkick) but what else would be good on here?

also what about interior? i plan on stretching the cab a bit, putting the back seats against the side and having a little table in the middle, entertainment system, everything. kind of thinking about going with leather, and the stitching and designs in everything to be based slightly off the ram longhauler concept truck.

also going to be raised, so should i go with some big offroad tires for an even more 'badass' look to it.

also gonna have a box top(camper shell whatever your gonna call it) on the bed, so what are some cool things to stick on or in the bed?

what engine should i go with that would fit in this bad boy? should i use what already came with them or should i go with a new engine and such?

just looking for general feed back and any suggestions. thank you.