Is the roof designed for the extra load?
Hopefully mine is now. No snow load here to speak of, maybe an inch every few years. I put the beam up between two trusses, running parallel to them, with a support post on each end. The two trusses were highly reinforced by adding twice the W bracing as original, then the two trusses were tied together and cross braced to provide what I would describe as a wooden bridge trusswork.
The two lower chords were also doubled up in height, and a plywood layer was added to tie the two chords together. After that, a plywood floor was added on top of the doubled chords to provide a tray for the beam to recess up into to provide more lifting headroom.
An additional layer of 2x6 collar ties was added at mid truss levels onto the triangle of the two trusses and the W members to attach the 9 beam hanger rods to. All these connections were bolted together.
It will pick up 800 lbs without a sweat, although I would not be leery of picking up my Bridgeport by adding a temporary stiff knee under the beam's center. A 4x4 on top of a hydraulic bottle jack works well for this.
I have about $475 in my beam setup by buying the beam steel new. The posts are 3" schedule 40 pipe from recycled satellite dish mounts, and a lot of the wood was scavenged free from work from various oak and pine shipping crates.
