I think the next project should be CASCODE amp. Amps in cascade have separate DC paths. Amps in cascode share the DC path.
It would be fun to put a MOSFET version together too using the 2SK669. (The K669 is used in FM receiver front ends so good for VHF.)
The AC circuit provides isolation between the input and output. The Miller effect is reduced.
If this has wet your appetite click the link at the top of the page and start studying the design.