Hi,

A decent drill press is pretty essential for drilling holes square to the surface. Get a machine vice which will CLAMP to the drill press table for holding small metal parts. Use the belt on the pulleys to give you the right speed for the drill or bit you are using.

A good handsaw is a lot safer than a table saw for cutting sheet material. (I use a few 4' lengths of sawn 3"x3" lumber on the floor as a stable bench. You have enough clearance for a jig-saw blade but those sort of saws give a wobbly cut and one side breaks out pretty badly.) A small Bosch cut-off circular saw is big enough for most Dobo projects. (You can cut 3" lumber from each side to get over its 1.5" depth limitation) It is lighter and more controllable than a 10" blade circular saw. I bought a cheap 10" circular saw first and returned it as not east to set and unwieldy.

A good small Router is pretty essential for cutting all the round parts you need for a telescope tube and Dobo or split ring mount. With a straight edge guide you can finish edges cut with a handsaw.

A few good quality chisels are useful as well. A diamond lap to sharpen them and act as a surface mill.

A good set square and 3' ruler make setting out as accurate as you need to be, along with a bit of Pythagoras geometry.

Cheers. Andrew.