I'm going to put a suggestion to the wife.
I will do what I can to sell her bike for the best price and oversea the deal on the condition that I can then build/buy whatever a modern 400 'fighter for her.
I'll get bored if I'm not tinkering with summat and this way I'll leave mine alone for a while...
I'm gonna do this as it will, hopefully, keep alive her interest in bikes and that can only be good for us both.....
So I'm looking for a modern 4cyl 400...cbr,fzr,zxr etc...even a gsxr...Doesn't have to be reg'd or anything...can be just a frame and engine.
Would look at the 400 bandit and xjr but they'll probably be too heavy as they are steel frame.
The cbr was 163Kg dry,1375mm wheelbase and 750mm seat height.
These are the parameters I'll be working to. If I can get $3500 ish for hers I should be able to turn something out....maybe even make a profit whilst doing it