rob .. while i havent flown that kite yey .. other then mark,s prototype for a short while.. i never use prism bags for my kites . because of that reason .. once i put the LE,S together from the factory i leave it all on .. if the tensioners stretch out .. cut them off and replace them with shock cords .. you can makwe homemade kitebags out of anything like i do.. i have used cloth from all types of stuff .. even old t shirts.. if you have a sewing machine .. makeing kitebags are eazy ill tell you how i do it in 3 eazy steps..
1.. with the kite folded up measure the length of the put together LE,S and add 2 inches to that length.
2.. cut the metreal untill you can roll it loosely around the kite and have the extra room to close the top... the result should be a big rectangle shape by this point..
3.. fold the rectangle in half evenly,, and sew the outher edge from end to end.. finally fold one end of the bag over and sew the bottom closed .. then hot cut the top if you dont have the hot cutter then just cut the edge and with a lighter heat the frayed edges..
by this time once the bottom is sewed you see the bags pattern and you can put a kite in it.. to close the top you can use a piece of shock cord or rubber band.. this is a cheap and good way i like to make my own kitebags.. other fliers will have their methods but this is how i do it .. if you get confused on how to do it .. send me a pm..