My tanks came to me prebuilt
... so I won't be doing that extended-bay thing.
The comments about long flight legs with standard 60 gallon fuel are in alignment with my expectations from what I've read here about LOP 65% cruise as well as full rich climb and time-to-climb to cruising altitude. The consumption just isn't that bad, and the plane's endurance easily exceeds pilot and wife's comfort on that kind of leg time.
I have pretty much decided this is a relatively easy mod to do, if desired, after I gain some flying experience, with only the paint job really at any risk of ill effects from doing it then vs. now.