i got a suggestion, about an amp wich i think could be cool to build, well i can't buy any other amp yet and i don,t whant to because i have all i whant with my current ceriatone jtm45 bluesbreaker .

but if i had to make an amp a day, it would be based in the jtm45 circuit, but with switch for choose, solid state rectifier or tube rectifier,
another switch for activing /desactivating the cap on the bright channel volume knob/pot.

i would also set a switch for activate / desactivate a bypass cap of .68uF at the V2 cathode 820ohm resistor.
a switch for set the amp between A/b push-pull and class A for less watt and different sound if this is possible.

impedence selector with voltage selector like the bluesbreaker and fuse holder that we can check fuse from outside of the amp.

a external bias mod.

i would add as option or another model featuring a reverb with footswitch.
and so maby a master volume but that it can be disabled "i don't like master volume too much"

hope this can help or give some idea if you decide to make a new model of amp.