Good advices for a newbie (threading tools lathe)

[rendoman]

many thanks!
this project really needs a wide range of different skills, for sure more then I have now!
I havn't glass blower or furnace-forge, i had a small only propane tank with short blower for tar and tin, but without oxigen I think it's not possible to reach temperature of 1500°C, working temp should be 820°C.
I'm thinking to make an internal template on lathe, maybe in aluminum or brass (or iron) and then drip melted glass over the 2 joined tube to give greater thickness ...

the good new is that after the polishing of the tube smal panel, i can try to weld circuit!