Looking at Brownells, barrel vise inserts are $50 for steel, $60 for aluminum, receiver wrenches are $110 and timing gauges are $80.
They might be worth it for a professional gunsmith who is going to do dozens of Garands but those tools really don't need a terrible amount of precision to make something that could last for many Garand builds.
I'm going to make my own set using scrap metal and a bit of oak.
I bet I'll save enough to buy a pull through chamber reamer.
First thing, it seems that the GI barrel contour has diameters of 1.1" and 0.865" at the chamber end. I'll measure before I do any cutting but I have read that people have used 1 1/8" and 7/8" to make barrel vises so that is easier to find off the shelf.
I have been reading about the CMP receiver wrench and the Brownells wrench reviews so I will make a hybrid with an oak insert to protect the finish and the handle at an angle that allows it to tighten the receiver in an upright position with the handle horizontal.
The timing gauges seem very simple but might need some precision to work accurately. I might make mine adjustable so that I can dial in the precision with a screw and use a nut to lock it in.
Any way, I didn't see much that was made the way I would do it. If you know of cheap tools or designs that would be good to copy, let me know.
I am almost certain that I will not be making more tools than I need but I hope anyone who likes to DIY will copy or improve upon what I do.