Well warthog in my opinion those fish boxes were never thought out well and we don't use them I don't know if you've ever tried to put a 40 lb yellowfin in one of those fish boxes but they don't work very well so to me that space was dead anyway
Finished install on our Parker rod holders on a 2820.these are all aluminum,tig welded and media blasted with power coated primer and finish.Also has HDPE center and stainless cup holders with drains.We can also build to your design.