Some tedious work here, assembling and unassembling, Needed to take time as the dimensions and relationships between front and rear wing attachment points and the comparative diagonal measurements of the top of the frame are critical.
While not in the directions this way, the engine mount must also be fitted. Note that this is after the cabin frame has been fitted on top. Anyways, this also involved some drilling of critical holes (they do after all hold the engine on the front) but went together easily enough.
Looking ahead in the instructions, I am guessing it will be challenging to fit the fronth sheet that covers from firewall to instrument panel as in the instructions, subsequent to permanently installing the cabin frame, show the sheet being installed without the frame in place.
The included jigs to help align the parts
Drilling the tubes
Engine mount fitted. It is starting to look like something