When I was about eleven years old, I used to go into the woods behind my grandmother's house on exploration adventures with my friends. Without fail, we'd pick up handfuls of mossy sticks, start leaning them against trees, and talking about how we were going to make the "best fort, ever." There would be a treehouse. And a rope swing. And we'd run an extension cord through the woods from grandmas' house and we'd set up a TV set and an NES and bring out some chairs and we'd even have a little fridge with colas and people would come from all over and beg to be a part of our awesome fort.
And then we'd get tired or hungry or the sun would start to set or the mosquitoes would get too bad and we'd go home. The fort never got beyond those mossy sticks leaned against some trees, and maybe some scrap plywood and a rusty bucket of nails. But, by God, we were going to build that fort some day.
This is how I see Jace's gamershack.