S3GE's Modular Entity Construction System(MECS)
i have also thought about something like that
the only problem i saw with this , is when you go online into a multiplayer game , you need to "Glue" all objects and keep them together which can cause a mass of Lag , then i realised , after i'll manipulate the character with items , i can create a new Temp mesh for that session only and "upload" what i need into current game session , then i have only one Object to follow and send its vars over web.. so customize is my opinion for every game i'll make , btw , look at the car , no wheels ? yeah , customizable
about the logo , im thinking more of a Character type rather then a 3D Text Mesh , which can be easily made in 2D with high texture level.
character - well , you want to show off what the engine can do right?
so the character , should be able to walk , run , climb, shot , cruch , strafe , rotate around , all animations that we can think off , then when a new guy comes to develop something with the engine , he can simple use that one , same as the ones we have in DarkGDK , but just more towards S3GE.
if i will do that , it may take some time.
but i really need an idea for it ..
problem with blender is that it export .X not so good and sometimes there are some problems or bugs with it , i think you should work on Exporters for S3GE, so you'll have full control over Bones/ Animations /Materials and such.
the best part with S3GE's Modular Entity Construction System(MECS)
is that you can make seperate body parts therefor seperate materials and shaders on each part, now again should be converted into one Model so it wont cause lags online ... hmm.. well alot of work.