You can mail them any of the following A letter explaining who you are and what you can do for them.A calendar with your picture and contact information on it.A bottle opener keychain with your contact information on it.A pen with your contact information on it.The area you choose as your target area should be a neighborhood that a lot of your social media friends and followers live or do business in.

Try through caulking.You can get latex and acrylic and silicone caulking.

Not cheap but reasonable prices, ~$200 for a larger framed canvas or acrylic print. 

Any smaller cracks fill with siliconized acrylic latex caulk.

@Bob S.I always paint the inside usually just the same color. acrylic cabinet paint

You can't fit them thru a typical 24" bathroom door on a remodel.You can still do the acrylic surround, you just use the one where the tub and surround come separately.

Also, lookup the difference between Acrylic and Rotomolded tubs.

Acrylic tubs never rust.10.

We thought of having it converted to a one-piece acrylic or fiberglass shower and called Home Depot.

There is no way I can install skylight  Some sun tubes can be routed, look em up  https://www.homedepot.com/p/VELUX-14-in-Acrylic-Dome-Sun-Tun...This is 1 of the more common ones, there may be others IDK.