If the buyer reads that whole paragraph, I'd be mighty impressed. I couldn't get past a couple lines before my eyes started to wander and my brain started saying "ack."
I mean this respectfully, but if you don't want to claim the set is 100% complete, avoid using "100%" anywhere in your description. We all know buyers don't read descriptions. Keep it simple...
"Adult owned, not guaranteed to be complete - i.e. it may have missing pieces and I did not verify the included pieces against the parts list. In good condition and will be shipped partially disassembled."
Nobody cares if you built it (though some do like the adult built part) or had it in a closet for a year.
ALSO - You really should ship disassembled unless specifically requested by the buyer. Greater chance to have stuff bounce around and get scratched up. If I opened a box with a bunch of partially built sections and some loose bits, I'll likely be frustrated right from the start trying to figure out how to build the damn thing (or that I have to take it apart just to get the build enjoyment).