I used Gary's CAD for min but then modified the bottom pieces to fit around the fascia. Because mine are from gator board I chose to permanently attach them to the main part of the vents. It works for me because I typically have to remove the vents completely to transport the whole thing. I don't drive with it in place so engine access is not an issue for me.
Attachment 48789
BTW - if you are planning on having the engine cover cut our of metal too, make sure you don't forget the little wedges that weld to the edges to create a lip that sits over the ridge in the pontoon - just like the factory cover does.
Here's a more detailed pic of the reactor. Everything here is found at the home center. Note, I didn't worry too much that the plumbing hoses weren't exactly correct. My "oil separators" are empty engine coolant bottles I painted. The cross over tube fittings are PVC plumbing that I shaped on a bet sander, my alum hoses are too big, the hubcap is not screen accurate but was close enough, the reactor top is another hubcap piece, the heat sink fins around the reactor I fabricated from plywood.
Attachment 48790
I have since got the correct hubcap and the Pioneer speaker grille that goes on the tachyon generator (both from E-bay)
Attachment 48791
A close turbine for the top (from a friend) and the rubber mat used for the vent joint and on the tachyon gen (Amazon)
Attachment 48792
The correct heat sinks (direct from supplier)
Attachment 48793
I have found one oil separator (working on finding another) and have the correct aluminum hoses on order.
Let me know if you need any more help.
Cheers
Steven