OMG! *Why*?!
Because it's fun to do "modern" stuff on 1993 machines and I guess that it can help to learn the basics of modelling (as long as you don't render...) :-)
I guess you could run Blender on your Classic thanks to MorphOS 1.4.5 (at least the previous version worked on my Efika, a GRex with Voodoo should be able to handle it).