I only go with Vamperic Sceptor when im up against someone with poison...IE Twitch or Teemo...or as of late Vlad. Any other time I go Boots and 3 health. I also get Meditate early more often as it keeps people backing off of me when i step to my Turrett and refill my life and then come back in. Ive saved many a team mates simply cause I was willing and able to eat some damage so they could get away then heal my self and defend till they got back.
I will mention I dont get why you spread around your Runes so much...Q runes and Mark Runes Give the most Boost followed by Seal then Glyph. What ever I want the most of I use in Q and Marks. THen I let the Seals and Glyphs pick up where im lacking or looking to top out. With my Yi I followed the Master Yi guide Cutting With WuJu to a T except for the Glyphs...I swapped what ever he suggested for Cooldown Runes.
Hope to see how this evolves guy since I wont vote on it cause you said its still a work in progress.

"I'm starting to notice that with zeal before inf edge."

Notice what? you stopped in middle of sentence XD

The boots is a good choice for going solo lane. or if you are expirienced enaugh to feed yourself in early game. If not i would stick to vamp scepter than boots than malady.

Good item build, i would agree with Beaker tho, you can save as draft if its more your progress stuff, and post it when you get it 100% done.

@ build i recomend lvling wuju style before anything else (exept ulti) you wait toooo long with it.
I would also suggest getting at least Zeal before the infinity edge. you will still need some AS and movement speed since your ulti will be still lvl 1 by that time (should be :P )

I'm not going to point out the flaws. I'm going to give -1 due to level 15 build :)