What was the total cost for your best/final set - expansion pack (with shipping or tax), paint and supplies?
I paid out approximately £10 (sterling, UK) total to make these pieces. That was for a used copy of Tower, Black and White enamel paint. I used a satin varnish that I already had.
How long did one set take to make?
I started on 28 Nov making the white pieces (taking off the 'apex' on the top and undercoating). I also applied the first coat to the black pieces. These were left to dry overnight. On 29 Nov I gave the pieces a quick sand down and applied another coat. 30 Nov, I applied the final coat. On the evening of the 30th, I applied a coat of satin clear varnish. They were then left to dry. They were completed on the 3rd Dec. So about 5-6 days.
What did you do with the tiles that came with your Tower pack?
The tiles will be used for creating some of the fan based variants/expansions available here, so they won't go to waste.
Would you mind if I copied and posted your photos to a wood crafter's forum to get some input from others?
No problem. I suspect they might be able to provide better tips for getting a better finish, better paint to use, etc. Let us know any advice they might be able to give.