I had the same thought several years ago. To that end I made a CMS designed to make writing this sort of post easy[1]. It never got out of closed beta because I just could not find people interested in doing and documenting projects. Most folks want to do one or the other - both is rare. Even this undeniably awesome windmill project still took eight years for the writeup to appear.

Anyway, I've still been using the CMS. Here is a small example of an incrementally written week-long project: Construction of an Eight Pound Candybar[2]

[1] http://redraftable.com/about/

[2] http://kmkeen.com/candybar2/