I never used a ring gap filer, it wasn’t necessary for my build. It’s a pretty specialized tool and there are workarounds if you need to gap your rings.
The ring compressor, didn’t buy one of those either. I put my pistons in from the bottom of the cylinders, the cylinder walls are tapered, larger at the bottom of the sleeve, they go in easily from the bottom. I used the popsicle stick method, but honestly I could’ve put them in with my fingers. If you put the pistons in from the top of the cylinders then a ring compressor would probably be a help.
My chain breaker/ riveter came from Cycle gear, I can’t remember how much it cost me now, but it works for both drive and cam chains, just remember to grind the head off of the rivets you are trying to push out or you will put too much strain on your breaker.
And as far as your torque wrench goes? Snap on is a great product, if I were a professional mechanic or money was no object, you bet! Me , I’m a cheap meat, I’ve got a 1/2” , a 3/8” , and a 1/4” all from Harbor Freight and they work just fine for a shade tree mechanic such as myself.
Good luck buddy! The fun is just beginning!