1) Premature panel failure potentially related to minimal UV protection.
2) Lack of headroom (the door is only 5'4" tall).
3) Thin aluminum components make for flimsy structural support.
4) The sliding door design jambs and comes off the mounting mechanism.
Here are some suggested alternatives I used in the construction of my 6x8 to address these shortcomings.
1) All polycarbonate panels are covered with high quality, 6 mil, UV resistant film.
2) "Raised the roof" nearly a foot by constructing the unit on 2x12 lumber set on edge.
3) Designed my bench and shelf structure so this doubles as solid support for the weak aluminum framework.
4) Hung the door on hinges rather that using the slide design.
I estimate these upgrades cost about $80-$90 over the normal cost of building the 6x8 unit.
![Image](https://www.instructables.com/files/deriv/FHK/H6ES/HCB8QBNV/FHKH6ESHCB8QBNV.LARGE.jpg)