I'd guess that he hasn't actually got one to measure yet.
I think the thing to do (if you're serious about doing the conversion) is to buy the Tamiya(Revell) Nissan(Toyota) Terrano and then take some measurements and then post the details on here. Their will then be somebody who can help you out. I'd guess a Ninco raid chassis or similar would fit but until you have the model in your hand it would be hard to be sure.
I think forum members "rallyp" and "PeteN" have produced raid style slot cars using Tamiya bodies before, perhaps they could advise you.?
I believe that all of the Mini 4WD cars have the same chassis, the bodies are scaled to fit the chasssis. So if anyone has one from the range, they could advise the wheelbase from theirs.
I have a couple of the earlier versions - Mercedes G-Wagon, which has a very short wheelbase and sensible wheels and tyres, so not like the newer ones. For it, I replaced the motor with a Scalextric one and fitted a drop-arm guide. It's not very quick, just a fun machine (and v noisey).
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