doing the same thing with my academy hummer -- the pickup type, with the bed. only mine is copper wire with a bar in the middle so I can make the mirror workable. I'm still gonna cut up some plastic sheet for the mirror itself...got sidetracked making DML's modern marines. Tamiya's modern accessories set is on the store shelves, so we can add the CIPs on the doors and hood.
I made the steering workable by drilling out the linkages and connecting them with wires. While not perfect, it allows me leeway until I can get it on a diorama.
To accurize the wheels of the academy hummer I trimmed the hub's lip so I could push each hub near flush with the rim. Just need to do something about those tyres, though. Too thin to capture the brute look of the HMMWV. They say Blast Models has the right wheel set for the job. We don't have them here in the Philippines, so scratching would have to do...