GURPS resources for low-tech assassination campaign?

[fmultimedia]

Hello guys.

Me and my group began playing gurps in a "medieval"/fantasy setting a while ago, at first having a very "general" themed few adventures - in order to get the feel and the hang of the system. So far, so good, we're all loving it.

The ultimate goal, though, it getting to a point where the group (three people) become a sort of "assassination elite squad" (something like the guys from the movie "wanted"). Though a bit of magic, supernatural beings and stuff are still present, the focus will be on martial arts and infiltration.

The whole group is very keen on the idea of trying out a GURPS play-style that becomes almost board-game-like at some points: scouting, planning strategically ahead, counting each movement point, every single action, etc. The idea is to use hex-maps drawn by me =p to their full extent.

My question is whether there is any kind of resource that touches the theme in one way or another - assassination plots and twists, mechanic resources, premade fantasy indoor hex-maps.... anything will help.

Also, I welcome any and all tips you might have =)

PS: as a side note question, is it alright if I post (in a new thread) the ideas for martial art styles my group is developping and ask for help giving them the final touches?