If you drive a walled vehicle daily...rear-fill is the least of your worries.
In the build from the vid u posted, that it just trying to obtain the best on-axis response w/ minimal refraction. Your front and side windows, as well as the dash can cause all kinds of havoc w/ sound refraction. Having a large mid/high enclosure on axis w/ the listening point can greatly improve SQ.
But, even w/ a perfect positioning of mids/highs/subs....the car audio environment is far form an anechoic chamber.
alright. thanks canann. ill post some pix has i build. i might only have time to do one side at a time. but i do have a ? for glass wolf about time alignment
with my set up i am not sure if i have anything way to align my tweets and mids that are next to each other. so i was also considering building the 6.5s a little more forward than the tweeters so the voice coil on the 6.5 and the tweeters will be the same distance away from my ears.
i was going to get started on this today........ but i had to get my fiberglass from my friend and he wouldn't stop talking to me so it was dark when i got home
driver alignment. I'd shoot for a cross-car pattern. aim the passenger pod at the driver, and driver pod at the passenger, so to speak, so you get a somewhat wider sweet spot where both sides cover the same area. You could get a rough idea of that using the propsed driver position, then using a laser pointer aimed directly where the speaker will be pointing, placed where the speaker will be. Then arc the laser 30 degrees from center both left and right to get a rough idea of dispersion angle for each driver.
That's a decent way to start.
also; fiberglass is the last step. you first need to find the proper speaker placement, then tape them in place and give it a trial run for soundstage and imaging to see if they work where you put them (cardboard templates work for this.) Then you need to make the wood forms to hold the drivers using a circle jig and a router, and a jig saw. (that's one way to do it) Once the wood forms are cut, then you stretch the cloth over them, staple in place, and resin the cloth, etc..
i think i am talking about something a little different. i am talking about the tweeter and the 6.5 that r next to each other. i was thinking about making the 6.4 coil and the tweeter the same distance away from me. so the tweeter will be set back inside of the pod more than usual