Length: Novelette (Approx 30 Pages)
Full text(html; paginated) : html p1; html p2; html p3
Wikipedia article: http://en.wikipedia.org/wiki/%E2%80%94And_He_Built_a_Crooked_House
ISFDB Biography: http://www.isfdb.org/cgi-bin/title.cgi?58495 (multiple variations)
Scribed: http://www.scribd.com/doc/90442902/Heinlein-and-He-Built-a-Crooked-House
(I converted the above html pages to a single 28 page PDF)