So I have seen that one of the biggest problems that Clan vs. IS Assaults are having is that DDC's are able to mitigate the clan LRM spam, allowing them to get close to the slow Clan assaults and chew them up. I figure this build can give them some backup. LPL and Streak 4/6 for ok damage, 2x AMS to cover, NARC to bring down their shields.
I like the idea a lot. Definitely good is your lance dropping. I was thinking about working something like this into one of my Timberwolf builds but I may have to go with something like yours. I've noticed that the advanced NARCs really help out, especially if they are used and there are lerm boats on your side.