@Jerac
Well, I've built it!
Another angle and in flight
Overall, I love it! Felt a bit apprehensive with some of the brackets being forced together, as I keep expecting them to pop out, and it took some time to get the wings aligned so they'd close as horizontally as possible.
Only malfunction I've had is a pair of 1x2 rail plates attached to a 1x4 tile popped off from the inside of a bottom engine when I opened the wings all the way. But I've learned some interesting connections, and might customise it further in the future to taste.