agree with everyone, better then what the majority of youth are doing with their free time... I built forts/cabins up until I was 17-18, I don't see a problem with that...
I would be lying if I said I still didn't get the urge to build a fort/cabin while looking at shore, trolling in my favorite remote fishing areas!! and ill be 29 this week lol
if it wasn't for work, mortgage, bills, baby on the way, just a general lack of time I would be all over it...enjoy it while your young Matt, I look forward to getting my child involved in these sort of projects.