Wow what a snazzy new chair!
As for popping those wheelies I say go for it, dont worry about the marks cause when it all boils down for it your already in prime crouching position to wipe them up after you finished. So I say have your fun.............but take care of the evidience before the missus gets home!
Hope your feeling better and thanks for the piccies its nice to see how your going.
Sal
The most important questions you will ever answer are those that your children ask you. 
