Right, had a look at the series that was covered a couple of months ago has no general arrangement drawings and they were teh sprung type which it sounds like are too fancy for you.
Issue 4347, 4348 and 4349 described some unsprung ones though still with a fairly elaborate top, 4347 will give you the basic proportions.
Its a pity you did not ask a few days earlier as I had a nice full size one in my had which was a much plainer round bodied design, being used as teh basis for some 1/2scale lamp kits.
Are you a subscribe which will make looking at 4347 easy?
J