Thanks, friends!
I've decided to use some more of the original Ventura elements rather than spares-box parts. The horizontal stabilizers are actually quite nice and the main landing gear doors were easily trimmed to proper dimensions. You can see the extra thick sprue attachments, especially on the one gear door. It was simple to just saw off the stub and then use files and Dremel tool to sand the extra plastic off. I've found this kit was manufactured with a really easily worked plastic, easy to file and sand but yet not extremely brittle. I should also note that the trailing edges on the wings and tail are quite thin, even thinner than "normal" kits in many cases!
Jumo Powered Bf-109s In 1/48
After working out some other issues I offered the wing to the fuselage. This proved somewhat tricky in that the upper wing surfaces were too long to fit without an overhang at the tips. The best result was to glue the lower wing in place on the fuselage and let it cure. Then I test-fitted each upper wing part and trimmed off excess material at the wing root until good fit was achieved. This worked out just fine and the final result is like any average kit:
Jumo Powered Bf-109s In 1/48
Now some extra filler in places and some sanding. Primer isn't too far away:
Jumo Powered Bf-109s In 1/48
In the photos you can see the small addition of styrene sheet on the back of the cockpit where the "glove box" is located. This is really all the additional detailing I did to the fuselage exterior, the rest is pretty much kit parts.