55.2-59 Front kick panel speakers and AC Bulkhead

[hotrod1]

I was looking at Kyle Bush's 56 build on Detroit Speed's site. It looked like they cut away part of the outer cowl panel to mount the front speakers. Pages 11 and 12. https://www.detroitspeed.com/blog/po...6_chevy_truck/

Here is what an outer cowl panel looks like. (https://www.holley.com/products/rest.../parts/OCP59RH)

I am not sure if they replaced any of the panel. What have you guys done to mount the speakers up there and how about the AC bulkhead or pass-through?

Ideas? Thanks