Some of you may have seen Bastion conversions like this.
This one isn't mine, but I made one ages ago when the kit came out but we haven't used it much and never really in a way other than a plain bastion.
I was thinking about it today, trying to come up with reasonable rules and points cost.
A standard bastion is 75pts, AV14, medium building (capacity 20), with a battlement on top. It comes with 4x Heavy Bolters and has an option for either an Icarus Lascannon, Quad-cannon or comms relay.
What I'm proposing is a straight doubling of points to 150, and calling it 2 separate medium buildings - each with a battlement.
The buildings would be:
1 - Bunker at the bottom with the lower battlement next to the tower
2 - Tower section with top battlement
Access points
1 - the original door into the bottom bunker section at ground level
2 - a door from the lower battlement into the tower
3 - hatch from the lower battlement into the bunker
4 - hatch from the top battlement into the tower
Weapons
2 bunkers would mean 8 included Heavy Bolters. 7 of them could still go in the usual positions in the tower, but one of the normal positions would be lost to the door onto the lower battlement. I'd propose relocating this Heavy Bolter and mounting it on one of the railings.
Each battlement would have a position for an optional Emplaced Weapon (Icarus, Quad, Comms) and each building would be eligible for it's own upgrades as per the "Multiple Part Buildings" section of the Stronghold Assault expansion
The building would be a straight substitution for a standard Bastion as both a stand-alone Fortification or as part of an Imperial Strongpoint Fortification Network
Thoughts?