Good work! One problem with the Sig 1/4 CUB is that the top firewall engine mounting bolts have blind nuts that are forever sealed in place where they can't be serviced in any way. There is a flat tank compartment top piece that mounts horizontal behind the firewall that doesn't give access to that area. I cut most of the center out of that piece so I can get a hand in that area if needed in the future It really doesn't serve much of a purpose that can't be dealt with in other ways.

I love the SIG CUB and still have a fairly highly modified version still in my stable but the kit did get a bit dated over the years. It's a shame that a version 2 never came along as many of the building challenges you have come across could have been designed out with newer construction techniques. It's still a great airplane! Mine is powered with a DLE30 but any 20 - 30 gas engine is a good choice if you choose to go gas. Have had 4 stroke engines in CUBs before but didn't care for them as I'm just not a 4 stroke guy.