So I can't get any of my upgrades then, and the whole exercise and discussion has been a waste of time  :'(. Without the XL engine, I don't have the free tonnage for the Light PPC. And the Ultra AC has no value beyond being lighter, which would be the other portion of weight I need for the PPC.<br/><br/>The 200XL out of the Hunchback is the best I'll ever be able to find, since they're both 50-ton mechs; obviously not identical engines, since one is IS and one is Clan, but they're the closest equivalents across the tech bases. If this isn't acceptable, then I'm stuck with the Mech I have permanently - The blitzkreig is not an Omnimech, so if I make any changes to it whatsoever, it would be a complete rebuild; even swapping the autocannons would be a total rebuild, since the weapon is in the right torso and the ammo is in the left, necessitating reconstruction/replacement of both those areas and the center torso connecting them.