Hello Sten
Some years ago I had a similar modification done on my B32, replacing the wheel pilot with the electric ram system. More recently I’ve upgraded the original ST4000 control head with the Evolution system which is absolutely superb. To mount the electric ram I had a marine ply mounting plate glassed in to the rear hull, in the space aft of the rear cabin. This was done by a professional GRP engineer to ensure that the ram lined up with the steering quadrant on the rudder stock. It would be possible to DIY if you think you have the necessary skills!
Hope this helps…
Ian Culley (B32 Another Fantasy)