I find this thread interesting on a couple of fronts. The OP noted that he just wants a plane to fly around the patch, and wants it as light as possible to keep it fun to fly. Those are great and noble goals.
But, a full rebuild is a VERY expensive and time consuming process, even more so if done right. There are a number of mods that can easily be done during a rebuild, but which are VERY difficult to impossible after the rebuild is complete.
So, while the OP is building the plane for himself, I’d also suggest incorporating those mods that don’t really add much weight, but which may be desirable to the “next owner”. In part, that should increase the value at sale (maybe).
As to keeping or removing the right fuel tank, an 18 gallon tank adds a lot of potential weight, both when empty and certainly when full. A right side tank was one of the things I added to my 11, because in the areas I fly, fuel stops can be few and far between. I added a Biplanes 12 gallon tank, which is a bit lighter, and provided lots of fuel.
But, that added tank required cutting brand new (relatively) fabric. The mechanic who did the mod was a fabric magician, and it was near impossible to see the changes. But….$$$.
Of course, that’s not the OP’s problem. But, things like the SC elevator cable routing and trim, I’d absolutely install at rebuild, whether I felt like I needed them or not.
Consider adding some of these things that weigh very little, for the “next owner”.
MTV