I came up with a similar build for this, but exchanged the UAC/5 for regular AC5 and a slightly slower engine, but more heat sinks. I think there is too much potential for over-heating with your original build Blagg, especially on hotter maps.
I like the Idea of using cooler AC5s and the high amount of Heatsinks in your build. You wont overheat over sustained long time. What i dont like is the downgrade of the Engine / about 5 kph. Personally i'm not a fan of dropping down Speed below Stockspeed. But for the Cool Efficiency I'd give your Build full stars! You should post your decent build in a new thread.
Had the most consistent results with this one: Orion is to slow for chasing mechs up to the cidada with torso mounted weapons, even with full basic. so the pesky scouts can feel the LL more consistently if they come near you. Heat becomes a problem on a lucky streak without jamms, it still is easily manageable.