So awesome!
I would love to play this, although it actually makes me want to play FF again instead of D&D. And then D&D FF style! dayum.
One thing in your PDF that really hit home was the idea that different towns in differently challenging zones had different gold piece valued items. But your idea to make a gp to proficiency bonus rating is inspired. It's very videogamey in a good way. I kind of miss that aspect of collecting gold to upgrade gear. In 5th edition there are only basically two steps to buy after starting gold, 500gp armor and 6000gp armor. Beyond that, there's no standard equipment price increase. You can buy the best non magical sword in the entire kingdom at level 1. They at least had the right idea with plate armor costing a lot, but it stopped there. Two handed swords should cost at least a couple hundred gold. Or maybe all the weapons in the PHB break on a natural 1 and take cumulative minuses to damage after every three battles unless they are sharpened by someone with the skill.
You need a sink in the economy and the D&D economy stinks. All the prices are out of whack, plate armor is fine but there should be several other things that could be really good. At least differentiate by metal. Like bronze, iron, steel, adamantium weapons. Also by craftsmanship.
You've given me a lot of ideas for my own campaign that I think my players will like. I haven't toyed with the equipment table much but I very much like buying better equipment and having something to spend gold on. That's the thing with 4e, players at least had a reason to collect gold, even though it ended up making magic seem dull and commonplace. In 5e magic items are rare and special, but gold collects in people's banks for retirement, there is no reason or incentive or even possibility to reinvest it in better stuff.
