Very nice Otter sir! A unique aircraft to model, not many kits or plans out there! Unionville Hobbies in Canada have a 96" span "fun scale" Otter kit/plans, and a smaller one too I believe.
I assume you have flaps on it. The full scale Otter has a 'fore flap' which lowers the ailerons with the flaps. I can't remember exactly how it's rigged up. (I fly a twin otter for a living and get all these dhc planes systems mixed up in my head
The unionville kit has a fore flap which lowers the flap and aileron separately from the flaps. With it fully down, and full flaps down, you almost have to add power to make the field! Pointing the nose down is a huge must! And down she comes, albeit slowly, just like the real deal.
Please keep us posted on the completion and how she flies!!
One thing to keep in mind.......in Canada, if a float pilot forgets his water rudders down on takeoff, the penalty is a case of beer =)
I converted mine into a "Texas Turbine" Otter. Powered with an electric set-up, pulling about 1700 watts on 9s. I wish it was on floats.