I bought one of these, and on doing some research on he internet, found I'd bought shares in a minefield.
Having benefited from some kind support from other modellers, I can advise that the TVR Macaw G was 38' over buffers, 35' over headstocks. So, in my dry run of assembly, I make the Ratio kit around 2' too short - and 6" too wide. The length is lost in the space between the middle stake pockets - it should be 7' but it's 5'. I think this might have been done for trainset curves.
Also, I think the difference between body and solebar is too small; moving the solebar in would bring the model closer to the 7' 4" dimension over solebars of the prototype.
All in all, a lot of work to put right.
Cheers
Jan