Interior window metal trim question

[G-ManBart]

I'm starting to cover the interior walls with steel liner panels, and I'm not sure how to go about putting trim in the window framing. I can use flashing with a 90* bend, and put one piece per side, but that's going to leave gaps at all four interior corners where they meet. The local steel/aluminum places can't make a compound bends, so that's out. Any ideas?

My thought was that if I could get something in a V or H shape that would let me at least overlap the pieces, and avoid a gap, but I'm not sure where I'd be able to get such a piece made. I was planning to run J channel all the way around the perimeter...so I don't care if there are gaps on the vertical flats...those will get covered by J.

I did a mockup with some aluminum flashing, and I'll try to post a picture of that later.

Heres one of the windows:

 

[homebuilt burner]

My dad's shop has aluminum trim in the windows. It is bent at a 90* against the window itself and an opposite 90* to over lap the wall. It is true that there would be a small gap in each corner, but you could bend the corner of one piece and overlay the next side trim, then go over the top with j-channel for the wall steel to sit in.

 

[homebuilt burner]

It sound like you have talked to a local place about bending trim. If you had them bend the AL into a 90 like you were thinking then you can bend a 1" overlap using a sheet metal bending tool found in the heating and cooling tools at Menards' if there is one near you. It is 12" long and mostly flat with a slot on each side, one side is 1/2' deep the other is 1' deep. $7.99 I use one all the time for trim work( I even carry it in my tool belt). I don't know how to put a website shot on here yet, but if you look on the Menards site under hvac tools you will see it.

 

[G-ManBart]

I think I did a poor job of explaining what I was looking at. Here are a few pics that might help. One is with the metal I had bent, the next is a closeup of the gap I don't like, and then with the J channel lined up roughly where they will go.

 

[captain14]

Have you tried looking on you tube to see if there is an answer? I can see what you are trying to do but not sure how to explain it in "proper terms". I have watched others do work around the neighborhood And my house last fall.

Home built burner is explaining it well I think, but I am not an expert. I know the tool he is taking about or similar and the one I have interchangeable blades of 3
1/2, 7 and 10 inches. HD has a version back with the other aluminum products or around the lumber/roofing products
Called a metal bender (Amerimax home products) claims to bend metal, seams metal,straighten edges and stretches fabric.

 

[sselander]

why not make the bottom (and top) with a tab on each side that you can bend up.
the side piece would then go over it. Then you would not have that gap.

 

[G-ManBart]

Aha...it just sunk in what you guys were talking about! I'll get new top and bottom pieces that are cut 2" longer, then bend a tab for the overlap. Thanks!

BTW, I found the tools mentioned, so now I just need to pick one up.

 

[wssix99]

To me, this looks like a job for welding. Go a little thicker on the material and you can grind down the welds and case the window nicely.