It says on there that that the bulk of the parts are 5mm (the main area on left of pic) and the others- the small area to the right- are 3mm.
Hmm - maybe I'll have to look at the files more closely! So far, I've only looked at the PDF as I don't have any software installed to view the DWG file (need to find something for Ubuntu at some point).
I'm fetching it all tomorrow: the cutter guy is near my work.
Well, that's convenient. We actually have the manufacturer (Universal Laser) of the laser cutter our TechShop uses near my work, but I don't know anybody there who'd take on the project if I wanted it done (which is too bad, because I've been told that if you work there, you can basically use any machine you want!).
I have yet to find the hex brass standoffs in all the sizes: my electronics supplier only has very short ones- I suppose for mounting boards in enclosures- and I'm not sure where to try next. But all in good time....
I've been looking at a variety of options here - I can't say for certain, but I would bet McMaster-Carr would have every fastener part needed. Between them and Grainger, among a few others...
EDIT... re servos.... looks to me like the servos are readily accessible for replacement, at least going by the vids. So for the first build we'll probably just use the crappy 3x hobby servos we have (4.3kg), then upgrade later. Unless it looks like a pita to replace them, in which case I might spring for 3 decent ones up front.
Well - based on what I have seen for the assembly - you would have to disassemble and re-assemble the base components quite deeply to replace the servos, which wouldn't be easy until after a couple of times doing it (and even then, it might still be a pain to do).
Our objective here is to give my daughter a decent test- and development-bed for her studies. With a decent arm, and the flexibility this one gives for end-effectors, she can concentrate on the control side without having to worry about a crappy arm made of ice-cream sticks and rubber bands falling apart.
Then I would say going with the low-cost "crappy" servos you already have might be more than sufficient to use first time out; you might try to find their spec sheets, and compare them to the spec sheets of the servos that the uArm team use in their current prototypes (they are using some form of "Power HD" brand analog servos - maybe one of the images can give you more detail - or you could ask them).
If your servos seem close enough, it might work out ok (that said, don't try to pick up anything too heavy if they don't have somewhat higher quality gears and/or bearings - or things might break).
Good luck with the project!