What's your interpretation of giant?
This is my own Newtonian friction drive fork mount.
It will take up to an 20" although it will be only taking my 12.5" f6 at the moment.
The fork is made from 19mm ply and several layers of fibre glass with a steel frame in the base.
It is very very stiff and easily takes my weight of 110kgs with minimal flexure.
The RA shaft is 90mm x 500mm long with 2 pillow block bearings and the DEC are 1.5" x 2 with 4 flange mounted bearings.
I am using for the RA a 650mm friction roller drive discs made from 3/4" plate steel with SS rims .
The Dec is the same size but made from 30mm ply (to keep fork weight down) with a SS rim .
The drive gear is Mel Bartel's Go-To servo system and has been used on 40" scopes.
http://www.bbastrodesigns.com/#limitedwarranty
This friction drive system is what is used in most research observatories as large gears are to expensive.
Ever priced getting a couple of 12" gears into OZ.
It offers 0 PE and back lash but the controller has electronic correction for this for any type of mount and can be used ALT Az for dobs or any mount design.
I hope to have it all up and running with in the next month.
Could all be down sizeed for a 12" scope only.
Mark