An average STD build but it only costs 6.5 million C-Bills as opposed to the usual ~10 million. And if you're good at protecting your legs, you have a fair bit more shielding on the left side. JJ is for maneuvering and downhill strafing.
I think this build is poor for a number of reasons. Why spend the money on one of the best mechs in the game, drop the cash on Endo, FF, and DHS, then cheap out on the engine. I can see being cheap on the other 2 versions where you are going to grind them out and sell them, but this one is a keeper. The engine choice seems especially strange since it doesn't come with a 250, so unless you own it you are ditching a 240 and buying a standard 250 to make it slightly faster and have a poor weapon load out seems like a strange corner to cut. If you aren't going to spring for the XL, why not just stick with the 240, switch out the center medium for a medium pulse, then add another jumpjet and some head and arm armor.