I'm assuming you have name, contact information, and all that jazz at the top of your one-page document.
Work Experience
Mechanical Engineer
Are all of these bullet points relevant to the job description? There's a lot and it's an exhausting read with how you have design stuff mixed in with management responsibilities and some programming.
Quantity of stuff is unimportant. For all I know, you could have redesigned your products to use off-the-shelf parts, downloaded CAD files off McMaster-Carr, or even simplified designs to use fewer parts. Talk about why these things had to be made and how the project was the better for it after you did these things. Did your analysis reveal that using a part made of a specific material would result in it having greater longevity or whatever parameter you were designing towards?
There's a lot of "job responsibility" things here. Unless you're out of content, I would shy away from that, because it's not really worth mentioning that you did your job at your job. Tell us the impact you had at your job and why your efforts mattered.
Mechanical Engineering Technician
Drafted window maintenance layouts in AutoCAD...and wh
"Custom Equipment" like what? Again, why did you have to design custom gear rather than buy stuff already available?
You don't need to say "Performed formal engineering calculations to prove structural stability", that's a given.
Contract Design Engineer
Again, quantity does not matter as much as quality.
I didn't work at this company so I'm not sure what this structural steel weldement was used for and why it mattered that you "developed" it. I get that it's an original design, but did just stay a CAD file or did you take it through the full design process, fabricated one, tested it for whatever needs, and then went through the rest of the steps required to get it qualified for use in an operational context?
Mechanical Engineering Intern
"military-grade"
What does "CAD project components" entail - is this some kind of a radio or camera? What "other measuring tools" did you work with - if I hand you a micrometer, would you ask me how to use it? Also, why did you have to model this in whatever CAD suite?
Why did you have to machine these parts - is this to build a prototype for testing in the field? While you may have to work around an NDA, remember even military tech is being advertised in journals and in other media. Think about how a product listing would look. Your employer does not own scientific concepts/principles or commercially available tools.
Education
Technical Skills
Combine "CAD/FEA" category.
You mention a lot of other technical skills like GD&T and fabrication. This would be a good place to include that.