Why don't you be daring?
Build a chassis how you like it and then build the output stage then the splitter and input?
Steal from other designs or design your own?
Build a low powered Marantz or make the output ccs with multi tube selection.
There are Mullard, Pye, Leak to name just a few...Dynatron...loads of amps you could build.
Get inspiration from guitar designs<<sounds nuts but how many substitute output and input tubes.
Build a switchable input tube /output tube etc design.
Variable FB or FB types..set yourself free...
This idea of if its not an established design is pants <<just my opinion.
The only thing that might be restrictive is DC coupling so give it a miss<<each section is then a building block.
Build a mini Manley Stingray..https://www.google.co.uk/search?q=manle ... AMM8oHM%3A
Build a Magnavox for a laugh or Baby huey
How good is your art work:https://www.google.co.uk/search?q=unusu ... k_z0Z-M%3A