First a correction. Almost all solid state ( SS ) sets do have HV regulation.
Its all done with the main power supply.
Its an interesting project. If you use a modern in line jug I would
try to work with the yoke it has. You may look into Zenith EFL tubes also.
They could light up a room & very reliable.
Another thought was what Panasonic & Sony did in the early 70's. They
had separate hoz sweep & HV stages. Just a cool idea if you want to
be different. It may also make some things easier.
Last note is if you eventually want to build a full blown OTA NTSC set
you can cheat with a Zenith IF strip (SS) & tuner of your choice.
Or if you want tubes look at the Zenith IF's on the sets from abt 1958.
They had 3 6BZ6 or 2 6EH7's & a 6EJ7. Those Zeniths had better
sensitivity & selectivity than ANY TV. They saw things other sets
were blind to.
73 Zeno
LFOD !