I tried 12x mining lasers and 2x mining pods on Colossus Mk3, with predictable results
Ol' Colossus III is extremely well-buffed by skills and is technically a Cruiser. There should be some way to make it tick, though I've had *very* bad luck trying it in the past.
You can get burn 9 with industry skill and thus burn 20 with no OP investments. They're acceptable carriers if used with sturdy fighters, since the built-in penalty is less bad than Converted Hangars. 32 DP for a full 8 wings ain't bad, though you're wasting 4 officers on a very questionable craft.
The main problem is anything collapsing on them is Game Over.
3x Herons can do the interlocking PD grid thing. Maybe with Advanced Optics, ITU, and elite Point Defense the humble Mining Laser Colossi can finally cover each others flanks... The Heron beam thing doesn't really work because of their DPS, but because that many overlapping weapon arcs intimidate the enemy AI into submission.