How would I make this engine stand in SW?

So I have this engine stand that I started working on in the summer, and have plans to do much more with.

This basically came from my head and was built from there. Now that I have some basic knowledge of SW I would like to expand my skills and practice on my own design.

The problem is we have only made small individual parts just to get into solidworks, so I'm not entirely sure of the steps I would take to turn my engine stand into a solidworks drawing.

The main stand base was made with equally sized lengths of steel, except for the angles which are cut just a shade shorter to account for the angle(I don't even remember what the angle is anymore)

Would I draw the stand as one single "piece"? Or would I draw each length of steel and "assemble" them?

I'd really like to get a mock up with this as it will allow me to play with ideas for the control panel to run the engine on the stand.

SolidworksGeneral