adding more trunk space - using a Boyd's Welding Gas Tank

[toadster]

Looking for some ideas as to whether this will be worth the effort but I have the Boyd's Fuel Tank which fills in the 'under trunk' space pretty well...
I have about 2" of clearance between the tank and the top of the rails that form the trunk

pic for reference
tank.jpg

The idea is to create a few prism shaped boxes that will be 2" deep, it's not much - will equate to about FOUR (4) sq.ft. of added space
it's not a ton of room, but would be beneficial to put 'stuff' in those areas that won't really roll all around, and give an extra 2" of depth in that space...

Here's a quick diagram showing the setup:
I need to create 2 access holes, 1 for the fuel sender (driver side rear), and 1 for the fuel pump (front of lower trunk)
trunk-space.PNG
the triangular shapes are ~16"x26"x18" and the passenger side is 18"x14.5x23.5"
both triangles would be 2" deep, example sheet metal triangle

sheet-metal-triangle.PNG
is it worth the effort for 4sq ft. more?