If I'm already going to be having to fix a lot of the main living area drywall, flooring, and balcony tiling, should I consider options to “enhance” while I’m at it to make the expense more worth it?

Like @JDMartin said, You can replace the enclosure by cutting that out in pieces and then installing a new iron tub and tiling the wall surround.

My understanding is that in Florida I do not need to hire licensed contractors to do regular routine maintenance (replace lamps, toilets, tiles, etc), is this true?

And I need 1 unit to store all my extra flooring, tile, wood, etc...

Tiles had to be removed which created a lot of dust. 

Lots of dust with tile removal.

This is second story and has tiles.

I'm not a contractor and don't do anything structural, but I would consider my brother in law and myself - experts at tile, kitchen, flooring renovations. 

And what is your experience with Rustoelum Tub & Tiles?

I can tell you a bathroom let's say that is getting an overhaul: new toilet, new vanity, new tub, new tile you are looking at 8 - 10k.