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Racie35, unfortunately Doug is sold out of those. He is working on an updated version using the more powerful 1407 motor. Hopefully available soon.

The longer servo arm DID make a big difference. It still won't snap roll very well but that's not what I was aiming for. The roll rate is definitely improved and where I'd like it to be. Therefore, the final solution for "easy" ailerons turned out to be a 1/2" fixed trailing edge on the upper wing ...

Well darn. Putting the servo throw back to 100% STILL didn't give me the response I wanted. Definitely better, but still less than ideal. If the longer servo arm doesn't do it, then I'll be officially out of ideas apart from adding even more aileron surface area.

Will definitely consult with Doug ...

Excellent! Will this be (eventually) done for all kits?

Will definitely pick up one of these at S.M.A.L.L.

This is excellent! Can we expect these for all the kits?

Here's the info sheet that comes with the Delta 250.

I have uploaded the build sheet to this forum. To save you a bit of time, the CG is listed as 7.5 inches from the wing trailing edge NOT including the elevons.
One word of caution when flying the Delta: keep your speed up in turns. If you don't, it will sometimes enter a flat spin. If that happens ...

You are correct that the red/white/black wired plug goes to the battery slot on the receiver. I'm pretty sure the yellow wire is for thrust reversing (used on certain "3d" planes only), which you will not need on a Papillon. As for the motor wires, mount everything on the plane and hook them up ...

I like the color scheme. As for servos, the EMax ES9251s are awesome in almost the entire Willy Nillies product line. A few really need the larger ES9201 but most work great with the smaller ones.