Check the how-to and free plans links on this site - good source of depron plane design for home mades - http://www.depronfoam.co.uk/index.html 

had this in my system for sometime now... thought i would post it here if its not already done
http://www.smallflyingarts.com/Free_Plans/free_plans.htm

any plans for coro other than the ones at spadto the bone.com?

http://www.spadworld.net has many plans and good discussion on SPADs.

These boards may be of interest :

http://spadworld.net/forum/viewforum.php?f=51
http://spadworld.net/forum/viewforum.php?f=56
http://spadworld.net/forum/viewforum.php?f=58

some more:

http://www.spadtothebone.com/SPAD/
http://www.remote-control-rc-hobby.com/rc_hobby.html
http://www.foamplans.com/category/parkjets/
http://www.rcgroups.com/forums/showthread.php?t=1012551 ( this one is one step higher)