Since the above pic I have found some front suspension (Definitely Revell - possibly '69 Corvette but I will be adding parts from a n AMT '70 Monte Carlo) and added mountings for it.
This enabled me to offer up the body to check rear axle location. The result of which was that I found I needed to shorten the wheelbase of the chassis by 5mm.
I did this by cutting a section out of each rail just behind the two mounting brackets on the inside of the parallel centre section of the chassis.
I glued it all back together and plated the top where it won't show.
After letting the glue dry overnight I started adding tubes the mountings for the rear engine and rear axle.
I want the engine mounted as close as I can get it to being directly above the rear axle and to achieve this I had already replaced the crossmember with the square (shock mounting) tabs with one further back.
As usual with this sort of work I have only a vague design in my head and make it up as I go cutting and gluing bits where I think they are required. Lots of offering up engines and axles takes place and sometimes bits have to be pulled or moved off before the glue sets.
I've just looked at my concept sketches and they say "scratchbuilt double wishbone IRS". Well that's not happening. I'm instead going for a live axle hung on either a coil sprung two link or four link set up.
I have a complete 1/25 scale white metal aftermarket Hot Rod four link rear end in the stash which I considered using but as always when I get it out and look at it I thought "no, it's too nice - this one won't do it justice".
Anyhoo, once I get both engines mounted I can then get on with fabricating the interior bodywork and things should speed up a bit.