Maybe I can help you out, I'm no expert but I know rocking metal armor even on a 3 con is fine, can remain relatively mobile (or be an immovable Tower), and there are some nice feats that synergize well with AR's and the Burst ability. I wasn't sure if you had Expedition when I whipped this up, and while Base game Psi utility abilities can be handy, I again wasn't sure if that's something you wanted to utilize.
This is what I believe to be, a generic Tin Can AR Burst build. Intended for normal difficulty. There's still so much meta knowledge I'm unaware of so it won't be perfect.
https://underrail.info/build/?GQgGBwMNAwbCh30AAAAAAF8yAMKHYGBNWWAAAAAAAFYkJjs5FRZKGUlbRU8OKAInto the later levels I was struggling to find feats to pickup as quite a lot are from Expedition. Temporal Manipulation is also, from Expedition
. Definitely would have had 55 TM and/or dumped extra points in there for Psi Haste and taken 1 or 2 synergizing feats. I tried to give you good crafting capabilities (crafting is so OP, for real.), and included what should cover all hacking and lockpicking checks in the base game with corresponding Haxxor/lockpick III's. Mercantile for all the special merchandise. Invest in the workbench for your house.