A spiral staircase to the upper level would make a wonderful attic storage. Love your 'new' clubhouse. Maybe a 'Crafty Carrie's Cave'? (CCC...Yes, yes, yes)
And call the one you have now a "man cave" ? And let mr. carrie use it for for a TV & pool playing area...or whatever he likes to do.
Try different colors on small pieces on plywood and put in different places in the new area, to see how the light plays off the color and what appeals to you...if you want subtle colors, energetic, bright or just plain white and clean. Thanks for the pictures and letting the rest of us turn 'green' with envy here. How wonderful to have a supportive dh. Can I send my dh to take lessons from your dh??
Our local Ben Franklin store has now been taken over by the grandson of the original owner and his wife...they are going to market in KC and will have 2000 new bolts of fabric next week. Our local hometown food store has moved into a bigger lovely area and reopened today; although the parking lot was sadly empty almost, it should win over many customers when it warms up a bit. No word or package from Amazon yet...maybe its coming by dogsled.