You can get any of the PVCcages assembled before delivery, it just cost extra. Going with the 24/20 like I did it was included and worked out to be a good bit cheaper.
I ordered the rhp, light, and perches. When I say it was plug and play it really was. Their was no additional cost to install the light or rhp.
My Aru male is between 4 and 5 feet and you can see how much room he has, he is coiled on the top perch on the left. I think he makes very good use of it and I don't think I would ever need to go larger. I do like the look of a wider cage but feel the 24/20 is very well suited for any gtp.