Hi Des'... [first time caller]................
Here's an example of a 1/9 scale chain used in a 1/24th scale context: although these are built up as individual working links, but even this wildly out of scale the difference still makes a "believable" heavy duty chain??
So you may be onto something using the 1/24th within a 1/32 configuration - only problem I can see is cutting and shutting the chain in order to get it to fit your required layout - but just a case of fiddlin' till it fits I guess?

Your Huck starter is an excellent build by the way - enjoyed that on it's own - even though I was supposed to be here for the Aircraft!!!
Although .................. !! sorry for this...........
The rear axle on your vehicle: Ford TT, is a worm gear drive which actually attaches to the upper [top] portion of the axle casing and not at the axle midpoint as you have it - an easy fix to snip it off and bend up gently - re-attach.

And one I made earlier.............

Hope I've been helpful rather than blotting my copybook already?? .......... Cheers for now.............................