This is basic stuff-the only CRITICAL DIMENSIONS are:
A-The width at the top where the altitude bearings are-must be just slightly greater than the width of the cage-so the telscope assembly can fit in!
B-Height-must be high enough so the scope can be swung to vertical on altitude bearings ie without the base of the scope hitting the base!
The base has 2 side panels, 1 long front panel, 1 small back panel (so it does not interfere with scope movement in altitude), 2 side triangles. All parts are cut and planed to required size and screwed together (predrill holes). The other 2 parts are 2 large circular pieces-one off them has 3 wooden blocks screwed to them and will be the part that is in contact with the ground. The other circle has 3 holes part drilled-into these I glued 3 pieces of 5mm dia teflon rod about 30 mm long-these act as the azimuth bearings ie the circle with the 3 feet sits on ground the cirlce with the 3 teflon bits sits with teflon in contact with top surface of first circle-a hole drilled through centre of both discs allows a bolt and nuts to hold them (loosely togeher) the top disk has the main base assembly screwed in place-with scope located the teflon allows smooth rotation of scope and base assembly on the static disc on the ground-see if you can work it out from the pic-the discs difficult to see in detail-sorry!