No, as of just now, the dimensions as stated on his site for the FS version are "approx 30 x 60 x 81 cm (12" x 23.6" x 33")". The Dahon Airporter is "26" (690 mm) x 33.5" (850 mm) x 13.75" (350 mm)". So given these 2 pieces of information there is clearance on all sides - maybe the length could be just a bit tight, but otherwise it should have been a good to go. Unless his approximates are like plus/minus 25%?
Edit update- Checking on the Downtube site Feb 15 2014, looks like dimensions have been updated to now reflect 13" x 24" x 34" which would exceed the dimensions of the Dahon Airporter.
Last edited by badrad; 02-16-14 at 12:52 AM.
Reason: Dowtube site updated with correct dimensions