I think the main roadblock with the Saito 220 is the ability to fit into the Ultimate nose. You might fit it somehow if you mount it inverted. I will just stick out way too much if you mount side way.

Another thing, this DP Ultimate doesn't have that much ground clearance. So a 20" prop may be close.

I had it w/ YS 140 DZ, and it is as perfect a combo as I can get, except for the gas guzzling DZ, which goes through 24 oz in 10 minutes w/ throttle management. Frankly, I think the 140 Sport will be perfect w/ APC 18x6W or Bolly 19x6.