Rolf,
After reading Srarecrow's post and thinking, you might want to get a few pounds of prepreg material to experiment with first. Before I built the autoclave, I made rudderheads and small parts in the kitchen oven or an insulated box using a regular vacuum bag set up. You need the high remperature bagging film and a teflon tube to use for the vacuum line. But, you can make useful small parts this way. If you go the oven route recommend waiting until your wife is out of towm a few days! Scarecrow also mentioned explosion hazard and he is right about the big production autoclaves - given the volumes, temp, and pressures we are talking about there is almost no risk. For the giant airplane size setups there is significant risk.