The BusNuts (the ones that convert old transit busses into RV's) build their own holding tanks to custom fit the compartments they will reside in.

  Here are a couple of links to some guys who built their own; you probably would just have to scale them down a little for a Camper. :>)

  <http://users.cwnet.com/~thall/george.htm>

  <http://www.gumpydog.com/bus/MC9_WIP/Plumbing/Holding_Tank_Fabrication/holding_tank_fabrication.htm>

  Good luck,

TJ Hannink
Goldibox - 1987 Vanagon Camper, Wolfsburg Edition
1981 Bluebird Wanderlodge, FC-33
Winter Park, Florida
http://home.earthlink.net/~tjhannink/
http://groups.yahoo.com/group/wolfsburg_campers
http://groups.yahoo.com/group/FC_wanderlodge
FAVOR website:  http://home.earthlink.net/~clubvanagon

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