I came up with something that I thought must be the solution to the main puzzle since it satisfied all the clues (except for the tile clues which I didn't quite figure out). Did I submit the solution incorrectly, or is this still not right?
More details in Rot13 because spoilers (though I don't outright say exactly what I think the solution is):
Gur anzr V pnzr hc jvgu vf n sbhe jbeq cuenfr gung vf svsgrra yrggref ybat. Svefg jbeq vf n ubzbalz bs n pbagenpgvba naq eulzrf jvgu fbzrguvat lbh fvg ba. Frpbaq jbeq eulzrf jvgu n cynpr lbh tb gb qevax naq vf n ubzbalz bs n yrggre, guveq jbeq eulzrf jvgu fbzrguvat lbh jbhyq svaq va n onxrel, naq sbhegu jbeq eulzrf jvgu cynprf lbh pna ohl guvatf. Gur jbeq zrnavat onpxfvqr vf fcyvg orgjrra gur svefg naq frpbaq jbeq, gur pvgl vf fcyvg orgjrra gur frpbaq naq guveq jbeq, naq gur ahzore (onpxjneqf) vf fcyvg orgjrra gur frpbaq naq guveq jbeq.
Jura V gevrq "fnl anzr" (ercynpvat anzr jvgu gur anzr sbhe jbeq cuenfr V pnzr hc jvgu), V jnf gbyq gung zhfg abg or gur ryrcunag'f anzr.