Just by looking at that schematic, where would I stop building if I only
wanted the VFO to use on a simple transmitter?
I looked it over, and have a pretty good guess, but I'm not certain.

IMHO, it to me as if:
Q1 is the local oscillator VFO
Q2 is the mixer (it's the only xstr that gets anything from Q1;
because of capacitors C9 and C10, the bottom end of R3 and the
bottom end of Q3 are essentially at ground potential to RF)
Q3 is the RF amplifier
Q4 is the AF amplifier
Qrest are elements of a push-pull AF output amplifier

--Myron A. Calhoun, W0PBV.
--
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)