differerence in build methods between these alumium centerconsole designs

Hi Folks,

I apologize for posting here, as well as in the powerboat section, but here I am really looking for input with regard to the ease or pros / cons of building between a few different designers / models.

I will be building an aluminum centerconsole this winter and am looking at plans and cnc files from the following designers / companies. If anyone has input into the quality / usefulness of their plans/ building instructions, or the build method (upright vs upside down), I would appreciate hearing from you.
I have my aluminum welding equipment, shop and am ready to purchase plans for my 1st build. Between myself and father-in-law, have reasonable aptitude for welding / building things like trailers, woodsplitters,etc.

specmar 1200 20'6"
specmar 620B 17' 6"


cope malaspina 18 18' 3"

cope Nanoose 22 22'

metalboatkits Trident walkaround 20 21' 2"