Chuckie. I have been wanting to do this for a while just havent gotten to it.  Loose the whole box on the back tube its sheet metal and not very stiff. Also the two tubes that come forward there of no value at all.
Here's the questions
What fuel tank you gona use trying for Suzuki theme?  Older RM ?  Or just steal a early black Tecate tank, Honda R?
Radiator style. Early Tecate easy or  dual rads? Its all going to dictate how you position the triple tree and head set.

The trick lower engine setup would be to bend a single  tube with the pipe loop in it andtie it into the single drop that's there now.

Just a couple Ideas I had. A possibility for fuel tank is also a early yz 250 83 -87 era if you like square and 88 ish to keep the body style.