Wanted to use every slot while going for maximum sustainability. To that end I decided on a STD engine so if I lose the left torso first my heat cap doesn't suffer. Some laserboats lose a lot of alpha when a side torso goes, but if you manage to lose the left first on this, your total heat per alpha barely goes down, so I didn't want the cap to go down. With full cool run and most -heat nodes, it alphas 4 times in a row and only needs to wait a brief moment for the 5th alpha. If you find that you do enough right side peaking that the left arm is dead weight, just shave it down entirely and use the weight savings to run a STD275. With a bit of leg shaving, you can cram in a 19th DHS. 19 DHS let you alpha 5 times with the proper skill build. Using ER mediums is possible (just ignore the left arm in that case) but makes the whole build run a lot hotter, so once you get in a real furball it's at a disadvantage.