As promised. My speaker shelf -
Not the absolute best job ever but does the trick, stays in nice and solid through friction but further secured onto the rollcage using some Jubillee Clips.
Accidently built it with a nice shelf in between speakers, the perfect size for a Halfords Full Socket set
or an amp in the future. Also got a super bright LED work light fitted as the Land Rover one got ripped out...
Whole thing is made of Ply & MDF covered in 3mm closed cell foam, then carpeted and stapled in place solidly
No reverb, or rattles, actually adds to the sound deadening of the car which is nice.