Good work on the IA, though you still have a few sections to complete before the 17th. No time like crunch time, right? lol. Anyways, onto C&C...
With the focus on rapid bike assault why did you choose to have your Chapter come from the Imperial Fists? Wouldn't it have made more sense to have them be descended from the Dark Angels of the White Scars? The strange practices of your Chapter also lend themselves well to White Scars culture.
I like the color scheme, though the addition of a darker cool color might make them more visually interesting and could be used to tie them with their parent Chapter in some way.
I'll echo the sentiments of others in regards to the idea of a Space Marine Chapter being regulated to territory control. While a Chapter would arguably have a high chance at successfully repelling invaders, their smaller numbers compared to the Guard would mean that they would constantly be spread thin over the area they are attempting to protect, especially if that area is frequently under assault. This fact alone would reduce their effectiveness as a force. The only solutions I could think of to compensate for this would be if the Chapter had more members than usual or if the area they were protecting wasn't very active, though if that were the case garrisoning a Chapter there wouldn't really make sense.
I'm interested to see this IA complete, good luck brother!