Hi, I'm strongly interested, my only problem is that I'm living in Levis, Quebec Canada, but I would assume a reasonable shipping cost.
Please let me know if you could get an estimate for the shipping cost.
Marc Zweili
PS: I owned on of the first Silvio's back in 2015
Here you find full instructions given by Bob Ratz
http://www.bentrideronline.com/messageboard/showthread.php?p=1176649#poststop
http://www.bentrideronline.com/messageboard/showthread.php?p=1176651#poststop
http://www.bentrideronline.com/messageboard/showthread.php?p=1176652#poststop
I have a 3ft wide corridor in my basement. That helps a lot. But still without the mirror in front, I wouldn't be able to ride. Initially it takes a lot of concentration. I prefer to have the front wheel on the double roller, it feels less twitchy.
Back in 2014 Alex Stegemann confirmed that the Omni Wheel is a good fit for the Silvio (see my first post).
The Velogical unit consists of two small rim motors. Have a look at their website.
Whatever motor assist you chose, the batteries will be heavier than the motor.