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Hey Scott,
I reused a pram and some 20mm MDF for my 12" dob. The MDF has 3 holes in it to accommodate the feet of the original dob base, and a central hole for the main bolt to sit in. The MDF is bolted to the pram frame work (bolts are counter sunk). The scope base just lifts on and off and sits their under its own 30kgs weight. So far no need to attach it more securely, I just hold the scope with one hand and the trolly handle with the other when I move it (without rushing). The handle is removable so you don't kick it in the night (and was part of the original pram frame work anyway). I left the brake mechanism on the wheels, but I don't even need to engage it. I was considering cutting off the 2 extra legs (at the opposite end of the trolly to the wheels), but so far they don't cause instability on uneven ground (sometimes it is an issue on uneven concrete where path sections join, but you just move the scope a few centimeters and it is fine). It works well on grass, gravel and concrete.
You will require a hack-saw, an angle grinder and some beer for this project. Maybe a jig-saw, and a hole saw for the base. An understanding wife and some more beer.
Cheers Tim.
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