The engineered conversion uses an extended wingspan, extended wing sheeting, enlarged tail surfaces and a modified nose structure. And tail dragger twins are very unpredictable on the ground. You really should convert it to trike gear. It would be a lot of work to make the twin from an ARF, but certainly possible.

The Giant Super Sportster Twin would probably weigh 16 - 18 pounds. I would use 1.20 four strokes on it, but 91 two strokes would also work.

Jim