A bit more precisely, Sum to 10 is not completely forbidden, but nor should it be taken for granted. This is from SRM Chicago FAQ Ver 0.6:
The Sum to Ten and the Life Modules systems are generally not allowed in order to facilitate as much balance as possible between characters playing Missions. At their discretion, however, gamemasters can allow a character generated through these means that they have examined and found to be reasonably balanced. Gamemasters should use this discretion very cautiously, keeping in mind the importance of balanced power levels in Mission games.If this is for a Missions campaign at home, it might fly, but don't go to a convention with this as your only PC.
See here for the latest FAQ:
https://www.dropbox.com/s/nxag7wgspxrjpgq/SRM%20Chicago%20FAQ%20Ver%200.6.pdf?dl=0Review it closely and note other implications the FAQ has for the character. For example, "you just can’t find generic drugs on the streets of Chicago just yet, so you have to purchase drugs from your dealer" for So Jacked Up. Missions has challenging rules for addiction tests; however, given your high Willpower, Narco, and Nephritic Screen, you can probably get away with popping Cram and Zen with no consequences. Don't do Jazz unless you're willing to spend Edge, since you only have a 17% chance (give or take) of beating
both the physiological and the psychological addiction tests, even with the lowered threshold thanks to Narco.