You're not saying how you arrived at the dimensions and internals of your enclosures. I started a similar project with some vintage JBL 14" woofers. Who makes enclosures with 14" openings? No one. So I got a circle jig for my router and did that. Done? No. Looked into it further and found books on speaker enclosure design. Turns out there is quite a bit to it. The dimensions, volume, whether to port, and if so, how, all depends on your driver's Thiele/Small parameters. Hopefully you can find these parameters in a database somewhere. Design software may include them. For instance:
https://www.parts-express.com/bassbox-6-pro-software-cd-rom--500-923
I bought a book and did the math manually. Pages and pages of it. Not doing this again... 
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Reparations for neanderthals!
'70 914-6, 1965 Mustang GT - RIP, '74 911, '01 Box S
'12 Ducati 848 Evo - RIP, '16 Yamaha R1, '13 Aprilia RSV-R
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