Minimum chainstay/crankset clearance I have just finished to assemble a track bike (Cinelli Mash Parallax with Sugino DD75 crankset).

Here is a picture of the distance between the right chainstay and the crank spider. I am anxious by how close it is (less than 1mm, probably).

Is it something I should worry about? If yes, what solutions do I have except for picking another crankset?
Answering my own question with some observations I gathered from other forums:


The bolt boss (the knurled metal ring) in the picture is visible only because the chainring was installed incorrectly. When I tightened the bolts properly, the metal boss settled inside the crank spider and I gained at least 1mm clearance. New clearance in the following picture:


 


Both chainstay and crank arms are objects that don't flex much, unless they are of poor quality, but this is not the case for my build.
The biggest risk is the chain dropping and getting trapped in that small gap. In my case the gap is small enough that it shouldn't happen. Moreover, given that it's a fixed gear setup without front mech, the chance of chain dropping are very low.  


Source: https://www.reddit.com/r/FixedGearBicycle/comments/4ck3h9/crank_arm_spider_and_chainstay_clearance_should_i/