I'm not sure what you are asking-

If your question is "Can I convert my Imortal Force to a SS" the answer is Yes.

-but-

If the frame in question (I'm too lazy to go look it up) has vertical dropouts (as most modern road bikes do) you may have issues with getting a correct chain tension if you arent running an external chain tensioner.

If you are buying a frame to build from scratch anyway, why not buy a frame with track ends that was made for single-speeding. The advantages of a SS-specific frame include: track ends allow easy chain tensioning, standard 120mm rear spacing so you don't have to add a bunch of spacers to fill out a 135mm rear, steel offers as plush a ride as CF but it's a lot more durable.

Your choice of 44/16 gearing should be fine for most riding conditions.