I'm playing D&D 3.5. I have a level 12 character who is 5th Psion (Telepath) and 7th Thrallherd. He has created a religion that worships ascension. To gain "immortality" he is going to use True Mind Switch to put his mind into a 18 year old worshiper.

I want to have a place on the astral plane where my old bodies can reside (so that they don't die of old age and I can avoid the level loss) after I use Microcosm on them. How can I build this structure in the Astral Plane? (I'm getting there via Plane Shift, Psionic.)