I think I will have the preliminary outlines of all 9 areas, quests and 5 NPCs finished by the end of the week. This will allow me to schedule the work and pace myself, at least writting-wise.
I chatted with Studios' Billy Bob, who does a similar format - a sequence of small TC mods - and he advised me on doing an area by area 'filling' with the material, so I will be trying to do this. Once I have completed at least one area, I think I will be able to forecast how long it will take me to do the Friggia M1.