Again, I can only refer to BK117 experience but these are a few jobs we did:
F1 car, practice before slinging into the Melbourne Tennis Centre
Lots and lots of concrete pours for the Mt Hotham Ski Lift company, all about 5,700 ft amsl
Stainless steel vat lift for Heinz factory
18 metre flagpole on top of No 1 Queens Street: 6 bolts with 2mm clearance on each
A backyard poolside bench for a Toorak residence: 1,250kg
And Mitch made this meccano set:
into this, up at Cradle Mountain
So yes you can longline with a BK117, and no reason why not in an EC145
