I've been thinking about this for you..

and as ball gunner has mentioned, not knowing can present a problem...
Stukas gennerally don't have 'cowl flaps, but they do have an air scopp underneath....

Here's a few thoughts:

Sand the inside of the cowl, and the outside of the fuse untill you get a tapered fit. reinforce the inside of the fuse as required: triangular stock, bits-o-scrap, etc...

Trim the cowl so it is flush with the fuse. Add a 'ring' around teh firewall that is slightly smaller than the fuse, to fit the cowl. Again, bits of scrap glued in place, and shaped to fit the cowl. Don't forget to put a few 'hard points / hard blocks' to accept the screws!

Trim the lower portion of teh cowl to vent teh engine compartment. this way the top, and sides of teh cowl can slip over the fuse, while the underside of teh fuse will hang a little lower then the cowl. You'll be mounting only three sides of teh cowl, not the intended four.

hope that helps.


and (if it works right) is a bit of inspiration...
(thank to www.airliners.net, and steve williams)