I cant help myself so will jump in as well........

Other things to specify will need to be minimum tools required. Materials must be readily available from local suppliers where possible. It may also be worth speaking with the usual suppliers to price up a budget kit of parts ( motors, drivers and ballscrews etc).

for people without access to lager tools like lathes and mills will need workarounds to achieve the same goal???

At the end of the day we have been here before and it did not really go anywhere. for it to work it will need more than anything some dedication and for people to agree to disagree and keep it simple at all times. they can make the fancy bits when they have had the experience of going through a build. Hopefully they will have a machine at the end of it to do it.

There my 2p's worth