Construction options
For differing tastes and budgets, some options are available in the construction of a Mini-anni
External Speed Controller
If the internal speed controller board can be removed (some early ones are glued rather than screwed in place) then it is possible to move the controller into an external box, for a cleaner top plate appearance.
New power supply
A quality toroidal transformer with 12-15VAC/1A outputs and a 9VDC regulated power supply can audibly improve pitch stability compared to the original  PT transformer.  
Vector drive system
The Funk Firm sells the idler pulleys it uses in the vector drive of its turntables and turntable upgrade kits. You can create a Vector drive system with a slight modification to the subchassis and plinth shape..