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I based mine as shown on a couple of flat firewalls I found on the www. It seems to put the DB in the proper position fire and art. I think the DB is a little higher than the 109 feet position no room for the top guns. However the exhaust stack is just forward and above the top surface of the wings, as is the case in photos. I feel I'm on the right track.
According to my notes Germans replaced the entire electrical system with a German 24-volt one and the on-board instruments. Also it is mentioned that Germans designed/made a new engine bed because the entire RR Merlin engine section/compartment up to the firewall was removed. However no info on how the engine bed looked like.
And then This! I gotta Dremel drill press for a song on local marketplace. So I drilled a 2mm hole in one of my acrylic right angle pieces, stuch the propshaft innit and Bam. I calced it for the hole with the kit plane on pads. And I can't believe it's fitting as it should!!!!!! woohoo. Next a bit of a mod on the firewall, locate the DB engine supports and I'm all in...Beautiful so far Bill