Cinelli Histogram - Component Help!

Hi Guys and Girls.

After a run of hand me downs and ebay buys, i'm finally going to try and build my own bike!

Im a complete virgin to a fixed gear build, and I apologies in advance for any face to palm questions.

Here is what I have come up! I would really appreciate any suggestions you have, a majority of you are lot more experienced builders and riders!

Frames: Cinelli Mash Histogram 2015 L 59cm

Wheels: Miche Pistard Track Wheelset

Tyres: Continental Ultra Sport II or Vittoria Zaffiro Pro Slick

Any suggestions or alternatives best suited to fixed gear riding?

Crankset: Miche Primato Advanced Track

Any suggestions for alternatives here? How does this compare to a Sram Omnium track?

Chain: No idea here! Whats a decent quailty black chain 1/8th?

BB: Miche Primato Track Bottom Bracket

Cassette: Miche Fixed Track / Miche Fixed Track Lockring

Any suggestions for alternatives here? Thinking of a 49x16 or 49x18? How is that around London? Im from Auckland, New Zealand so used to riding an entire city of hills!!

Seat Post/Seat: Cinelli Vai XL Seat Post / Selle Italia Max SLS
Bar / Stem: Cinelli Wand Black / Cinelli Mash Oversize Road Stem

I'm welcome to any suggestions here? Is this an area I should be saving on a and upgrading later?

Is there anything else stupid I have forgotten or overlooked?

Thanks for reading and to anyone that can spare a few minutes to help!