I got the tank today. It holds 26oz. Little over kill for this eng but better to much than to little. I can place it forward or back to help tune the ride of the boat. Also went with simple servo mounts this time. Just two blocks of Bass wood for a mount. Stu sent me the supper needle and made my own mount for it. Not much left in the tub to do just drill the holes for the push rod set up. Then time to do the epoxy work when the Carbon/Kevlar cloth comes in this week I hope. I is right at 4 lbs like this. Will see if I can keep it under 7 lbs.