Interesting additions to the thread from you both. Thank you for taking the time to type them up for us to read. Must say I do like the sound of blue Praetorians - any chance of a picture or two of them for us to see, of the painted ones that is? Every Praetorian model I've seen painted has been in the classic '1870s British-Zulu War' style of dark blue/black trousers, scarlet/blood red tunic, white webbing and white/fawn pith. Use of blue intrigues me.
Don't worry about your colour scheme being similar to the Blood Ravens Partisan, I've seen several home-made Chapters using a very similar colour scheme, but it sounds as though yours has enough variation in it to set it apart from those Blood Raven chappies.
My own unit, my latest work, is the Machinegun Company of the 56th Siege Regiment of Krieg. This force is built for doubles tournaments and as such it will have enough models for 875 points. However the Machinegun Company itself is a lot larger than the single 'platoon' I will be fielding.
The entire army will utilise Forgeworld Krieg models, of which I have 3 of my Death Riders painted and am workingo n the fourth at time of writing. But on to the army itself;
The inspiration came from the British Machinegun Corps (MGC) of World War 1, who would deploy sections armed with Vickers Medium Machineguns to support Battalions and formations, to give them heavy direct/indirect fire support. With the World War 1 French/Belgian/Germanic appearance of Krieg soldiers the idea stuck in my head - what if I switched out the bog standard tanks + fliers + infantry approach and went 100% infantry...with the maximum number of Heavy Weapons squads all armed with Heavy Bolters? Thus my current army was born. excuse the large image, spoilers weren't working when I tried previewing the post.

Now the big problem you will no doubt have spotted is that there is no anti-tank support - thats for my doubles partner to worry about (he's building an armoured force to balance mine out) and we're actually rather keen to see what 18 Heavy Bolters can do to enemy infantry.
The background is pretty much all in that one image, but I will be fleshing it out further with stories/engagements/battles they've been involved in, but thats for the future.