Well have my Mark 2 Mono Tank all worked out so I can mass produce them.
I did a Well lets say a Mark 4 with extra forge world armor before.
So this one is a Mark 2.
But with bits etc you can custom make them to be any chapter specific or whatever you would like.
As before it has maganetic side sponsons so you can change from Heavy Bolters to Lascaonnons in a snap.
I give you the front

side

back

the hud and controls

The side with bolters
and you can see the side lower anti grav support sponsons sticking out.
They apply anti gravity to keep the mono tank up right.
And apply reverse pressure to the front or rear not just up and down from the other side to allow the tank to turn.

The back shot.

And the side with the driver.
He can come in and out easily now (much more room) and there is a computer station and info controls etc infront of him.