Nice project which I'm sure will be very rewarding. This is a good site for information and help.
Some may argue about the 6V vs 12V but I think 6volt is just fine.
Post that question over in the Electrical Forum and you'll find what others think...... do a search and find hours or reading!!
Good luck. Keep us posted and what we can do to help.
Congratulations on your retirement. Nothing like it
