The most active Harpoon forum for the past 2 years or so has been the Harpoon Yahoo Group.
https://groups.yahoo.com/neo/groups/Harpoonsailboats/info There are also may photo albums. You should join
Shrouds go to a shroud adjuster, then to the chainplate. The forestay has a turnbuckle to adjust rig tension.
The motor mount for the 5.2 was originally a fixed position mounted to the transom. Part of the issue with the 5.2 is the pyramidal cross section - through bolting requires angled spacers and all-thread. To do a current fixed position mount would require an adaptor wedge. A fixed position mount is not a bad thing on a Harpoon, as it will get the prop an additional 10 or so inches aft, reducing or eliminating rudder/propeller interference.
Another problem with a 5.2 mount is that you want to mount to the port side, and hope to hit some plywood glassed into the transom. At the age of these boats, unless they have only sat inside and never been used much, the fiberglass of the transom will start to hollow, showing a strip of plywood up the middle where the rudder gudgeons are lag bolted in (unless a PO has through bolted with custom all-thread) and hopefully the plywood in the port side indicating where the motor mount would be located.
A properly through bolted wedge should disperse forces reasonably well. I would certainly make an oversized wedge, again to disperse the force of the mount.
Hope this helps.
Brian
Harpoon 5.2 what connects the shroud to the chain plate, the tensioner or turnbuckle.
Any ideas on where to find a motor mount, or should I have on fabricated?
Thanks,
BHH