Ok so taking a brief look through and TimW makes some very valid points; especially the 'short on text'. The plus point is Google knows about your site, site:http://www.makeseven.com/ says 19 pages so we know it's being indexed
I'd suggest starting to look at making use of breadcrumbs hierarchy and better use of the category pages as currently they are just a row of links. I don't think the URLs would be such a problem if there were breadcrumbs. The breadcrumbs would help create a parent > child relationship which search engines understand, for example /mechanical.html would be Home > Mechanical and /motorcycle-stand.html would be Home > Mechanical > Motorcycle Stand which says it's part of the Mechanical collection.
To improve the category pages I would recommend a list (ordered by published date) each with a picture, title and brief overview which links to the article page. In addition a little introduction to each category wouldn't go amiss; for example what is upcycling? Adding this info would boost the content quantity at the same time as introducing naturally found related search terms for the section.
The general meta data and titles could do with some work. Take the motorcycle-stand.html, you should really only use 1 og:image and in addition the dimensions should be given, see https://developers.f...om/tools/debug/, and https://developers.facebook.com/docs/sharing/best-practices.
Overall you need to tailor those titles, meta descriptions etc. I'm not sure why you went for "Product Design Showcase" as the site name, MakeSeven.com would have been fine. So page titles would be say "Motorcycle Vertical Lift Stand - MakeSeven.com", then the meta description something like "My custom made motorcycle stand that vertically lifts the bike to allow free access to all parts of the machine enabling complete disassembly of the bike." or something to that avail.
The interesting part is that there is not a heading in sight! So search engines are assuming that "Product Design Showcase" is the heading for every page, this is a big problem but to fix is easy, for example...
<h1>Motorcycle Vertical Lift Stand</h1>
I could waffle on for hours but this should be enough to get on with ... hope it helps!
(Also on a side note I spy Technics 1210s, I like to take a spin on the old wheels of steel, what's your flavour?)