If the IF is high enough say 11mhz its not too bad. Fundamentally the basic radio will
The only question in my mind is if the 4053 switch will work with a LO of about 40mhz.
Staying single conversion keeps the spurs down. If you can fine the spring 2006 QQ
I wrote up a similar radio for 6.
The differences are triple tuned bandpass for TX. Transistors that work at 6M (not 3904s)
I've used 2n4124s at low gain (~11db/stage) the final can be IRF510, they do work there.
I've used the IRF510 on and at 12V it will do 5-10W, higher voltages it can do over 25
(8 of them as 4x4 push pull do about 220-230W at 30V on 6m). Expect the IRF510 to
run about 10-12DV of gain and may need a bit more drain current. Also the gate drive
impedance is around 6ohms and you still need a .5 to 1 watt of drive
The RX need a RF amp stage, a common gate J310 will do at 10-11db. The 5351
does well enough up there and the 612 works well.
There are enough changes the price tag will be expected to be a bit higher.
You did a 6m converter years ago so you know the drill.