The cage I see is listed at 40x30x72 and is a big cage at $325.
the listing says bar spacing is 1/2 inch, that is good.
the tray looks nice. it is a nice size for several gliders.
I don't like that some bars are up and down, this makes it harder for the gliders
to hold on. And the entry doors are small, and I THINK there are lots of small doors that need to tied down tight.
I'm thinking this cage is acceptable. BUT I would recommend the cage I use
Midwest critter nation/ petsmart all things living.
At $220 (on sale now) and an add on piece $116 is $336 dollars.
the base cage is 36x25x48in inside area. with add on its 36x25x72 inside area.
the base tray has to be rigged up under the cage, but you have all horizontal bars and BIG front doors for total access to gliders and cleaning.
If you only have 2 gliders and they get out of cage enough, then the base cage is plenty big enough.