The first choice you need to make is - inside or outside!
Inside enclosures are best suited to people who plan to take their pet gliders out to play with them on a regular basis and also offer them lots of enrichment within their cage. They are much more entertaining than watching tv of an evening! Below is a more stylish way to incorporate gliders into your home.
The next option is obviously the outdoor enclosure. Here you have many different choices that can work for all types of backyards. There is no such thing as too big when it comes to housing animals. The only limitations really are your space and budget. The wire spacing should be that of what you get on budgie cage. Here is just one example of an outdoor enclosure that has been set up for Sugar Gliders.
*These pics are not mine! Credit to the creators of these beautiful enclosures!