In my limited experience there is no reaon not to run an XL engine in the Orion. Almost all my deaths are from CT and nothing on the side torsos. 3 large lasers to rip nasty gashes in armor and then follow through with hits from the LBX-10. A triple pack of Streak-2's deserve respect inside their effective range.
Slight variation in that I pulled the LLas for a PPC (Endo Internals are needed) and the SSRMS for LRMs (I find are more useful) so I can alpha without the heat penalty. It will run a bit hot if you continue to alpha on hot maps. You can group the weapons to three fire groups (2 LLas / PPC&LBX/ LRMS) based on projectile speed.
Wow, was about to post this thing but saw your build first. Although not an very obvious build besides the LB10-X this thing already works nicely with the current quirks and will getter better next week. current quirks: Additional Structure L/R Arm 6 Additional Structure L/R Torso 8 LB-10-X AC Cooldown 20% Ballistic Weapon Cooldown 20% Energy Weapon Heat Generation -12.5% SRM/6 Cooldown 10% Missile Weapon Cooldown10% new quirks coming Feb 17th: Additional Structure (LT&RT) +16 Additional Structure (LL&RL) +16 LB-10-X Cooldown +20% Ballistic Weapon Cooldown +20% Missile Weapon Cooldown +25% Energy Weapon Heat Gen -12.5% Energy Weapon Cooldown +12.5% Laser Duration -12.5%