Steel Structure 3D Model

Good morning everyone,
I'm new to this forum. I use Bricscad Ultimate V23. Do you know or have any advice for creating these types of steel structures? Each new job is different from the previous one. I saw that in the application catalog there are some 3rd party solution that do all this.
The structures are mainly composed of welded or bolted beams, gratings, handrails and ladders or stairs.
I'm looking for something “light” and less expensive.
Thanks to everyone and good work
Alex