-
Interesting solution, I was thinking of doing something similar but out of plywood, and have a shelf come up to support the laptop with a lower shelf where to hide the fan. Any reason you went with AL profiles? Other questions: Do you need/use that vertical adjustability you have there? Any vertical slipping? Any reason for having the base parallel to the bike rather than perpendicular?
I bought an axle mount and knocked this up for exactly the same reason.
Kind of expensive (~£70 for the aluminium and brackets) but am sure something similar could be done much cheaper.