Hi Marty
l got my wing tanks through this site plus some other parts that come up now and then its a great .
The sav wing tanks fit really nice into the wings l sat them on some foam strips which have sticky on one side they are fuel resistant
l bent up some brackets to hold the tank in place riveted all in similar to the 701 plans ,l will see if l can find some pics for you.
Because my was one of the first here in OZ it was only designed for the 582 but had a 912 when l got it so l have had to pull it all apart to do all the upgrades to get it up to the weight category and strength to suit the 912 , it would of been quicker to build a new one from scratch.
Plus the front fire wall was really damaged so l have had to rebuild it also, my has a 750 nose wheel leg on it now and l have beefed up all of the components it should last especially on my rough strip.
l still have a bit to go l am hoping to have it finish just after winter.
Good to swap ideas on this site l have learnt a lot off the other 701 and savy builders on here .
If you read Marks building dairy on the sav you will pickup some great knowledge.
Good luck with you build keep us informed .
cheers Geoff..