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Hello. New here and new to making GBG's. 

I am collecting parts to build an octave mando and a license plate resonator. For the reso, I have a vintage PA plate and I was thinking about putting a cone under it and I would love some advice.

I had a wild idea and searched ebay for, found and won some tart pans:

http://www.ebay.com/itm/6-VINTAGE-ANGEL-FOOD-MINI-TART-PANS-3-1-2-ACROSS-X-1-1-2-DEEP-/261133266035?_trksid=p2047675.l2557&ssPageName=STRK:MEWNX:IT&nma=true&si=ZkRcO1cOwBLho1joI5wxPeQ6DxY%3D&orig_cvip=true&rt=nc

If you ask me, they look like resonator cones! 

My question:

If I use these, should the cone be attached to the plate (I might hammer out the tins to make a small lip for attachment) or should I attach them to the body and have them contact the plate when the box is closed? 

I was thinking I'd put the pickup on the plate above where the middle of the cone touches the plate.

Also, would using two of these be overkill in this guitar? 

Since I got six of them I'll probably build a 'traditional' reso too...

Thanks all!