Most of my whiffs tend to be made from my stock pile of existing models and many of these date back many, many years. Whilst this means that, generally, I am working from a fixed resource, it nevertheless means that expenses can be kept to a minimum - something that appeals greatly to my Scottish genes! As a result of my Calvinistic reticence to parting with my cash, I am more than willing to accept that in the world of Alternative History an AFV which might otherwise have existed with a 5-spoke road wheel now lives with a 6-spoke wheel. In other words, I have looked through my stash and cannot find any 5-spoke M3/M4 road wheels and I just can't be arsed spending out to replace the Tamiya real life inaccuracy.
Shoot me if you want, but in my AH world the M3 Stonewall FSV had 6-spoke wheels!
The Tamiya vinyl tracks are, to be fair, pretty crappy and might be replaced sometime in the future but right now, they are all I have and will just have to fit the bill.
As for the rest I am going to keep things just the way they are. I really don't want my model to be the perfect solution to a M3 FSV, indeed half the fun of whiffing is to come up with something that is just as flawed (and therefore realistic) as about every other AFV in history.