Looks like a great start on designing.
Are you going to use 2D or 3D for the part design?
I use 2D for my designs.
The SR71 HABU I have in the download section is modified from scale.
https://www.papermodelers.com/forum/...yid=21&page=18 bottom of the page for the instructions and PDF for the model.
The fuselage diameter and a few other things were changed to keep the weight down for flying:
Mike