Just thought I'd chime in on the topic. One of the best options I've seen as a legitimate INEXPENSIVE build for a dome was an adaptation of a tent. A carefully chosen round tent could concievably be modified for above ground pools, but there again, I imagine wind would be an issue. For the northern climates where heating all year round is the main concern, a bubble or vinyl dome may be the way to go. However, in more moderate weather where pool maintenance and keeping debris out is the main concern, a screen dome with an 'optional' solid cover might work best. Its nice to still be able to enjoy the whether on nice days too without having to disassemble the vinyl covers or bubble domes. At the risk of being accused of making a shameless plug, for those that were asking for reviews and ideas, another brand out there is a DIY kit called The Pool Igloo.