i dont know what to tell you, the way i was told to do it from talkn with ayan4m1 on irc, was to make a package by adding what i wanted into the directory /pkg/mypkgname, then use build.pl -with-mypkgname, he also told me to learn the directory structure so i just been trying to fig stuff out on my own
as far as the mission.sqm i did not use the one posted, i made my own trigger points and changed their sizes how i wanted, but from what i can see it looks legit, your problem may be due to you not correctly adding it in
im not a coder, i dont claim to be, im figuring stuff out as i go, if my instructions did not help you any, im sorry.
the best i can tell you from this point is to tinker with it and try to fig out whats wrong for yourself, and post back what you did to get it working for you so that others may have more valuable info
as far as the mission.sqm i did not use the one posted, i made my own trigger points and changed their sizes how i wanted, but from what i can see it looks legit, your problem may be due to you not correctly adding it in
im not a coder, i dont claim to be, im figuring stuff out as i go, if my instructions did not help you any, im sorry.
the best i can tell you from this point is to tinker with it and try to fig out whats wrong for yourself, and post back what you did to get it working for you so that others may have more valuable info