Hi Marc,
Yup, you’ve got the right idea. You should be able follow most of the e80cc build and apply it to the 6or12sn7 universal kit. The capacitor mounting method is the same as on the Yuri as well. Just watch the length of your leads.
The biggest differences are the DC in resistor to drop 7v to 6.3v and the PCB.
Let us know if you have any more questions and we’ll help you along.
Charles