Miloh,
Glad to hear that it finally got there! Couple of opinions on some of the questions you asked:

1. I think you will find that if the Extra is anything like the Edge, that putting servos in the tail will be difficult for two reasons. Both revolve around weight. You said it yourself, these birds are lite. Putting servos in the tail will only increase tail weight on a plane with a pretty long tail moment anyway. Of course this could be offset by the engine weight. Guess you'll just have to play with it. Second is sub-structure. One of the reasons they are so lite is materials used. I would think that in order to get a set-up that you would be comfortable with for reliability and durability that a fair amount of reinforcing would need to take place. Adding again to the weight issue.

2. Pull/Pull should not be a problem, but I just do not think it is needed. In knife edge my Edge couples to the canopy which is a function of elevator of course. Pitch adjustment in knife edge is handled fine by the rudder, but with the extremly low elevator throws required for non-knife edge flight, there is not enough movement in the elevator to adequately adjust. I will need to play around with high rates or mixing for that. For a little added insurance on the supplied pushrod and collar arrangement, I took them out of the plane, set the rods to be even, set the collars and then wrapped the spaces between each collar with thin wire and soldered. This way, even if a set screw comes out of a collar in flight, the pushrods are still soldered together.

3. Control horns. I used the supplied control horns. As many others have indicated, I was concerned about the small washers supplied crushing the balsa, so I fashioned some larger washers out of the material that the wheel pants are made of. I could make them in the size I wanted and the spare covering provided goes on them really well.

4. The cowl is lite, but in my experience VERY durable. I took some 3/4 ounce cloth and put one layer inside with epoxy and micro-balloons up to about 2/3 of the cowl. I did this for two reasons. First since I was mounting my engine inverted, any holes in the cowl would be on the underside where the seam is from removing the cowl from the plug. In my opinion, this is a weak area. I did not remove the matching tape as it seemed to be holding things together. The cloth also added durability to the rearward portion of the cowl which on mine, got thinner as you move rearward from the front. The cloth also acted as reinforcement where the attachment screws went.

5. Knowing what I know now about the LG plate, I think I would have just knocked out the blind nuts, gone inside and added a layer of 1/8" ply where the screws go and put a full coat of un-thinned 30 minute epoxy in there if you can reach it. Then on the outside coat everything well with another layer of epoxy. Sounds like a lot, but it really didn't add that much weight at all. Then where the blind nuts were, I drilled and tapped for 1/4 x 20 nylon wing bolts. IMHO it is just a lot more durable and the wing bolts can still shear if they need to....in theory.

6. I had no problems with the canopy. I had a factory second included with mine and used it as practice for cutting out the "good" one. It looked good enough, so I am using it. The picture I posted of the dash is looking through the factory second. Guess I have a spare!

7. BTW, I went with 3" wheels instead of those supplied. My plan is to either get some glass wheel pants from Stans or somewhere when I get some carbon Fiber gear or just make my own pants with the lost foam method.

I really think you're gonna like this plane. Keep us all posted and PUT UP SOME PICS OF THE BUILD! No one else (me included) has done this as they go. It might help those out there lurking and trying to decide whether or not to buy one.

Cheers,
John