Solar power is really easy to set up these days. I did a few set up for cabins in AK. Pretty basic...if you can play with Lego's and wire a Christmas tree, you'll be just fine. I'd suggest going a little bigger right off the bat because adding more storage isn't as easy. It is getting affordable now, which is great! Doesn't take 20 years to pay for itself.
Project looks great and looks like it'll last many generations. Great job guys! I'd look at taking some of those pictures and ones to come and start filling those walls with the memories. It'll be really something for conversation now and in 100 years from now. Makes me smile just thinking about it.