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Should I make a wooden frame for the fencing and attach it to the wood porch support? How strong do I need for clematis?
I was thinking something like a wooden frame attached to the porch supports, and then attaching your trellis to the wooden frame. I can't tell from your picture where you want to extend the cattle panel trellis. but if you could extend a wood frame from one post to the other I think it would work.
Most trellis stuff is not all that strong. Usually thin lathes. The wood frame, if it spans a larger distance, might be better off with something like a 1X4 ripped in half or thirds. I would think that would be plenty strong as a frame. You could paint the frame the color of the siding or your trim to blend in better.
I would not want to put holes in vinyl siding. So, I think you are on the right track about building a wooden frame across that area and then attaching the trellis to the frame. it looks like you have lots of wood posts/supports/rails to build a frame system.
As far as the vertical under the porch roof is vinyl, as is everything on the right side, you might be able to make a wooden frame that is screwed into the wood on the left side vertical post and that top rail then making the top piece and right side a type of compression fit so you would not need to screw into the vinyl. For a trellis, I think it would be plenty strong.
I have made things like that before, like a frame within a frame, and that inside frame is so tight from compression that you don't even need screws. But you have the left vertical post and the top rail to screw into and that should make everything even more secure. I know what I would do, I just don't know if I explained it well enough. But I really believe it can be done without poking holes into the vinyl.