I played a game vs Evan on Wednesday.
The primary goal was to see if Bastion's can work at all. So I pretty much build the entire list around a unit of them including the primary plan of action. (Inspired by a chess article I read as a Child. "The over protected pawn" (I think it was called) )
Harby in Exemplar intediction.
Reckoner + Devout.
Battle Engine
Choir
2 x Knights Exemplar + UA
1 x Bastions
1 x Bastion Solo
Visgoth and Co (Martyr'able shield guards)
3 x Vassal Mechanics
The list is all in on the Bastion protection plan.
If the bastions take trickle damage. Spread it. If any takes a massive hit. Harby Martyrs to keep it on the table. Start of my turn they all heal one thanks to the solo. Then the vessel heals D3 to all friendlies (including Harby and my shield guards)
The vessel is also the source of up to two very good range attacks. That is at least 1 miracle and some damage from boosting shots. (In step the 3 mechanics for an average of 9 points of repair a turn)
I lost the game but the plan has lots of merit. I could have played a lot better and forgetting the feat because I've dismissed it as having no value was probably the cause of the loss.
Also, that Vessel is a lot more fun to play than should be legal.