[/img]OK here's the mount. I sandwiched the mount between two 5/16" 10" wide aluminum plates. Bottom one is hinged and attaches to front two mounting points of seat tracks on the pedestal. I centered it ( no port stbd offset)and mounted it with the seat adjustment midranged on the new mount, but centered at the point of the current location of the seat, about 3" aft of center adjustment, where the track is bent from me sitting on the back of the seat to navigate effectively. At this position, the seat swivels 180 deg.
It does rotate around on a plane of about 25 deg, but I will fix that tomorrow with two motorcycle fatboy seat springs mounted to the rear seat track mounting holes, that the hinged plate will sit on, leveling it. Might have to add a spring or three but that's cheap and easy.
The seat is 4" higher, and is closer to the steering wheel, which is low on an Epic. I think it is perfect now, depends how you want to see out of the windshield on plane and how tall you are. I tilt the wheel up anyway but you may prefer shopping kart kiddie car steering wheel position. You can do that but you can't swivel 180 at the furthest reaches of aft seat position.
If you wanted to go lower you could easily cut/modify the boats angled pedestal base. It is rugged, about 3/8" thick with reinforcement. On my boat, there's a tank under the floorboard, but either way you could easily reinforce and use a straight up tube pedestal base mounted to floor. It's just a hollow fiberglass platform, no big whup.
Access to slide adjustment is tight, it's on starboard side. It's easy to access once you turn 45 deg or so. I'm good with it.
I'll get some installed pics up tomorrow, it was raining buckets all day
