Ork vehicles are generally pretty open on sizes as long as they're modeled well and not blatantly modeled for any sort of advantage. People have used every GW kit out there as a base for kitbashes, fro the Land raider battle wagons, to the land speeder buggies, rhino-trukks, Devilfish, falcons... Even scratch builds.
I usually just start with a grot, an ork and a nob for scale, then start building. Using existing models as a scale reference helps keep the dimesnions in check and you can refer to existing pictures of other models with miniatures next to them for size comparisons.
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