Ended up running across a site called eylar.com , it looks like they sell the same exact cases but re-branded. Well they carry custom foam inserts for a very fair price. Turns out the 16" insert fits the apache 3800 case perfectly. They have a few options for the cutouts I went with the 5 pistol 8 magazine option. $24.99 +tx comes to $28 shipped .
Even comes with a red polyurethane bottom piece and a convoluted top piece
For those interested:
https://www.eylar.com/eylar-16-standard-hard-case-5-gun-18-mag-custom-foam-set.html
That looks super good especially with the red underneath.