This is just a basic representation of the SR71. I made this model to test the input shaping on the MK4.  I have included my Stl and also the 3mf that I used with the model split for printing with dowels.  The tolerances on the dowels are too tight so I would suggest editing them.  I cut about 5mm off them and drilled out the holes to 4mm to make fitting the parts together easier.  I hope you like it