guile usage in prototype 3d engine

[Anton N. Mescheryakov]

Dear schemers,
One may say I'am bizzare, but I try to make 3D engine embedded into 
Guile system.  Such kind of program needs high degree of modularity, 
extensibility and wise configuration, while modern HW T&L cards can 
deliver vast FPS despite CPU's ugly mess (like scripting engine in main 
loop:).  So I would be pleased to read some success/horror stories 
concerning similar guile projects etc.
Another thing: is it OK to use u-vectors as 3D/4D coordinates, or I need 
to introduce special smobs, or simply use lists?  Many aspects of guile 
are, er, not especialy well documented, including array access.

With best regards,
        Anton.