mini mount for 130pds

[beamer3.6m]

I am thinking of having a semi permanent set up and consider that a 'pico' style observatory (I.e. a very small box to house the scope) would be ideal.

I have the heq5 and the skywatcher extension piece already so at present I think I have everything I need to mou t it say 2 feet off the ground.

My question is that the extension screws into the standard tripod top which is obviously too high. Does anyone know where I can get some suitable 'feet' which will attach via the standard thread hole.

Also. Does anyone kniw what the dimensions would need to be for a 130pds on an heq5 in terms of clearance, I.e. what is the minimum sixe box I need and also height from the ground. The smaller the better. I plan on parking the scope so as to keep the maximum height as low as possible.

This is not for visual at all.