I’m not even sure how to approach this or if a sweep is the right command… all I know is this would normally be a “sweep 2”, with the bottom crvs as the rails, and arches as the profiles, only I now have 3 “rails” to use. Second image gives an idea the shape I want to create.
I think theres a way to break this down into multiples pieces instead by breaking some of my curves, but I’d prefer one combined surface because what I actually need is a continuous wireframe that I will be extracting once I make the surface.
I would definitely say that you need at least two surfaces for this. Just make the sweep from left to right without the middle part. Then add the middle part by matching and trimming.
Trying to make this in one go just isn’t possible or at least very practical.
Not sure what you mean by continuous wireframe, but when you are happy with the surfaces, maybe you can then extract and create the wireframe from the surfaces.
The most appropriate way to do this is using single-span surfaces with degree 5 (6 control points) or degree 6 (7 control points). However, it takes quite a lot of time to make the surface transition properly. Maybe more than 30-60 minutes, because there are some highly curved area that require extra time compared to slightly curved shapes.
An easier way to make this shape, albeit with multi-span surfaces, is to do what @jari.huuskola already mentioned above. Create a long Sweep 2 from left to right, then build another surface from the middle curve (maybe a door?) and match it to the Sweep 2 surface.
Not sure what you are trying to accomplish but I got the following by sweeping intersecting surfaces, then trimming where needed, filleting the surfaces and then a quadremesh.
