Apparently my response did not send the other day and is now gone.
I like your renderings, this is not going to be a vehicle I am putting a lot into. My crown vic is the car the NSv3s are going to call home where I will be going all out (rear deck blow thru 6th order is the plan for that) but winter the car sits however I am tired of the subs just sitting so in the daily they go for now.
I have a bottom slot ported box for 2 15s that I converted to a single 18 now converted to a single 15 and put 1 of the NSv3s in saturday for a meet. the dual 15 box for the car will be coming soon. with these subs even my extremely crude bastardized box is getting down, pretty sure with 2 of them on 2 5ks will be more than plenty and then some with the level I will take this car. I will need to play with the port but I am going to plan on doing the port up with subs inverted. I will make the port able to be removeable as well, do a gasket with screws then I can change and play with it to see what sounds best, as well as be able to easily remove the enclosure. I really never worked with wood up until last year and just jumped in. so I am a novice to say the least on what works and don't. I am unsure if slanting the port to unload on the back window with the subs loading on the roof will cause issues or "turbulence" with the wave crashing into each other? Or is it subs and port if facing the same direction need to be on the same plane?