Expanding wall?

The existing room (and house built in the 70s) has a lot of wood panels...kinds country cottage style. The existing ends of the walls were not lined up so if I put the panels on the ceiling in straight, they will not line up directly with the panels on each end. So, I am going to put them in diagonally. I think this will involve a lot more cuts at either end of the wood. Is there any trick to this, in the same way that some joists/strapping are put on diagonally?

I recently purchased my first home (a 1994, concrete-block single-story home, 2350 sq. ft. with a pool). The walls seem to be a bit funky - when some drywall in the garage was removed for some work I was having done, I noticed that the spacing of the studs seemed to be all over the place. Yesterday, I tried to put a simple towel ring on the wall in the bathroom, using the two drywall anchors that came with it. When I pre-drilled the first hole, I hit metal. The house does have metal studs (mostly 24" OC, it seems), so not a bad thing! But I wanted to be sure it was a stud. I grabbed my stud finder and was surprised when the light went off not only where I had drilled the hole, but for a width of about 5.5", all the way up and down the wall. This is an interior wall that abuts the back of the house. On the other side of the wall is a walk-in closet. It doesn't make sense that it would be duct work, and the house does not have metal pipes (the aforementioned work I had done was to replace the polybutelene plumbing with PEX). Here's a photo of the wall and the hole I drilled, for reference: [ATTACH]40111[/ATTACH] Is it possible there are multiple studs there, for some reason? If not, what else could this be of that size in this location? Thank you in advance for your insight!