Hi,
at first let me express my deepest respect what you did with the Merlin kit. This progress is awesome and everybody who knows the Merlin "kits" knows, how much work and sweat you spent bringing it to this high level. I never saw a Merlin kit built in that quality. Very fine!
I found both kits I mentioned before and saw that I once had started to build on the Sierra Scale AEG. I can show, what I have.
At first it's the struts arrangement of the vacukit, jigs in plastic for scratchbuilding these out of the struts material:

And here are the 'injection moulded' parts of the Sierra scale vacu:

here is the struts material of the Lüdemann Resin kit:

At last and as a contrast here's the bag with the struts and wheels of the Chorozy kit:

This kit is much much better than the other ones, but my copy is already sold, so sorry, here I can't help.
What I can do is to send you the parts of the other kits if you like. If I were you, I'd scratch the struts using the plastic material and the jig (and the scale plans of the Windsock datafile). I don't think that I would use resin struts in any scale, I would even replace the Chorozy struts. If you need some wheels, I can have another look what I have in my stash. The choice is yours, I hope that could help you finishing this great little AEG.
Best wishes
Borsos