When D&D 3E first came out, I created a planar cosmology for Spelljammer using the rules from Manual of the Planes. The cosmology ended up on the official Spelljammer: Beyond the Moons fan web site, and it now resides under the Lost Spheres section.
It is called Knightfall’s Spelljammer Cosmonomicon.
Since I first created it, I’ve updated it somewhat over the years, but I’ve mainly worked on my Farspace concept for my homebrewed World of Kulan campaign setting for v.3.5. However, there are two sidebars as part of the Core Cosmology that refers to what I call Spelljammer Gone Wild.
This alternate version of Spelljammer adds the Steampunk ascetic to my D&D 3E cosmology. However, what I created in those two sidebars is all that I’ve created, rulewise, for SJGW. There is a default background for SJGW that refers to a world setting I call Time of Ages. I’ve detailed some of its history, but I haven’t finished it yet.
So, what does that mean for this blog? Well, it is going to be dedicated specifically to Spelljammer and will be mainly about SJGW and Time of Ages. However, I’ll likely post my thoughts on the setting of Spelljammer: Shadow of the Spider Moon as well.