@jql said:

That won't have a very firm grip as it will twist upon the joint's axis. You should have at least 2 pins per joint... It also seems very prone to detach from each other. Maybe you now should model from what Mitch gave you.

Thanks, I will. I'm also going to use super glue to reinforce it.

Hide the box temporarily. Right click on the origin and choose Reset. Then unhide the cube and move it so it's corner is at the origin where you want it. Then use File>Save as template. Make a new template and discard the old one.