[Identify this prop]

If you polish up the body you may find the pitch and size stamped on it. The markings tend to get obscured easily.

The 1 and 2 tell you which blade to fit to which side of the prop. The blades will be stamped too.

[Fully battened main? Lazy jacks? Stack pack?]

I would like to make mail sail handling easier and more convenient on my Farr 1020. I'm thinking lazy jacks and a stack pack or similar.

Can you use a "stack pack" setup without full battens?

I have a spare main that still has reasonable shape. Is it possible to have it converted to full battens? What would be a good Auckland loft to do this sort of work?

[Dinghy fantasy]

If you're after a quicker, cheaper, self build nesting dinghy then the chameleon is a good option:

https://duckworksmagazine.com/04/s/designs/greene/cham/

 

[Dinghy fantasy]

How about a skin on frame nesting dinghy:

http://www.ventspleen.com/designing-the-lightest-nesting-dinghy-in-the-world/