Yes they are homemade....
http://purplesagetradingpost.com/sumner/macgregor/inside-index.html
If you go to the links page below you can get to a lot of other Ventures and MacGregors and another good place to look is sailingtexas.com....
http://www.sailingtexas.com/cboats99macgregors.html
I spent a lot of time there before we bought our Mac and got a number of my ideas there and from other people's web sites.
Where are you located and how long have you had your S and be sure and stick around as we need more members here,
Sum
Our Trips to Utah, Idaho, Canada, Florida
Our MacGregor S Pages
Mac-Venture Links