Hi Sticks,
I can't advise you on the business side of things (not my forte!

). Would be a good idea to try and talk to another pod who is already in a similar set-up to get the main idea of set up and equipment requirements etc.
In regard to the carpet, the infection control guidelines state that:
"In premises where there is no alternative to carpeted floors, the use of a hard wearing durable plastic carpet protector of at least 1.5 metre square, such as those available from an office supplier may be used beneath the foot rest of a podiatry treatment chair until refurbishment. This alternative is only suitable as a temporary measure until a vinyl floor is installed."
http://www.apodc.com.au/infection/na...on_control.pdfhttp://www.apodc.com.au/infection/na...on_control.pdf
In regard to the collapsible portable chair, I haven't seen one either, and depending on the room size, a physio plinth might be more useful as it is narrower than a normal pod chair and can be wheeled aside for when the GPs use the room. It's also useful as you can have the patient either sitting (for GTs) or lying down (for Biomech).
I would suggest talking to a medical rep eg. from Briggate, for advice on set up as they have done this many times already for other pods...they usually have some good suggestions regarding equipment.
Good luck with your new clinic! :)
Donna