I had a go at building it this evening. It was quite pleasant to do so - quick and simple.
Lower wing completed
Upper wing and pylons completed, ready for joining
Fuselage going on
Motor mount. Note the two sheets of foam I've used to space the firewall away from the back of the fuselage
Here's how I did the linkage between control surfaces: Control horns and a small length of pushrod on both surfaces joined with zip-ties to skewers. It's connected well enough to transfer the control movements but can still slip for trim adjustments: I also reflexed the elevons on the upper wing by 3/16" at the trailing edge.
Where should the CG end up?
All-up weight is 400g with Power Pack A and an 850 3s.
Some suggestions for the plans:
-Some sort of cutout in the upper wing skin for the servo connectors
-Markings on the lower wing skin for positioning the servos
-Consider making the wing joiners one piece by attaching their leading edges with a bevel - It would look a bit cleaner but require twice the area on the plans
-Some sort of plate to cover the rear of the fuselage and mount the firewall to
-Consider extending the fuselage >= 3/8" backwards to accommodate the shorter height of motors such as the 1806 for prop clearance reasons
Will report back once I fly it.