Hi Darren,
I have a shipyard general arrangement (Ailsa shipbuilding, Troon) of MV Coruisk built 1970.(Not to be confused with the present ship of that name), at 1/2" = 1 foot or 1:24.
This shows side elevation and plan, and some wheelhouse detail. At this scale she is approx. 40 inches long and 11 wide. No hull lines, but fairly simple shape.
As built two side ramps to suit slipways, converted fairly quickly to end loading.
I guess about nine cars capacity.
Tomorrow I can try to get a photo to post to let you see if you are interested,
regards,
Clark