LOL…That is my Head Model at the present moment.
I am in the USA. I am 40-Something pushing 50. I use the Imperial Units because that is how I see things.
You are correct about the Metric System; and, the USA International Businesses does use the Metric System as Standard Measurement Units; but, I am not an International Business; and, I am located in the USA.
To be honest…I have 3 years of High School Technical Drafting Training and some Collegiate Architectural Drafting Training; and, I am a College Flunkie. My Drafting Training didn’t include Computer Aided Drafting; because, CAD was a relatively new Drafting Technology; but, I did see a Computer System loaded with Autocad LT in a Tech School before Dropping Out of its Drafting Courses.
My acquisition of DeltaCAD 3.0 was a fluke. Most CAD Applications at that time (in the 1990s) were in the $40.00 USA to $80.00 USA price range; and, required Computer Systems that were more powerful than what I had access to. I purchased DeltaCAD 3.0 in just a CD Case at a Best Buy store for only $10.00 USA; because, I made a spontaneous effort to looking at some CD Cases on a store shelf while looking for a Computer Game System that could be played on the weak Computer Systems that I access to. After the purchase, it was a number of years before I actually downloaded the DeltaCAD 3.o CD for the first time; and, began using DeltaCAD 3.0.
DeltaCAD 3.0 is generally too weak for all of my Drafting Projects because it can’t accurately measure 1/32"; thus, it can’t even measure 1/64" or 1/128". Most of my Drafting Projects don’t require 1/64" or 1/128" accuracy; but, 1/32" accuracy is sometimes needed for some tiny portion of my Drafting Projects.
Besides that, I only use about 10% of the features that DeltaCAD 3.0 has to offer; and, I am unfamiliar with about 80% to 90% of the features that DeltaCAD 3.0 has to offer.
As far as my “IsisHead” Project is concerned, I may be tackling a Drafting Project that is beyond my Drafting Skill Level.
I have been non-professionally studying Human Ethnicity since my Pre-Teen Years; and, I am doing my “IsisHead” Project based on what I do know about Human and Animal and Robotic Head Structures.
From what I have seen in the Video Tutorials on the Blender Website, the 3D Modeling of Humans & Human Heads isn’t compatible with where I am at concerning 3D Modeling of Humanoid Androids.
My current DeltaCAD 3.0 “IsisHead” Project is flawed; because, I messed up on the Layering Process. I hadn’t used DeltaCAD in awhile when I started the “IsisHead” Project.
Also, restricting myself to Full-Scale Drawings that can fit onto 8-1/2"x14" Legal Paper isn’t going to work. I am going to have to abandon my practice of limiting my DeltaCAD Drawings to Letter & Legal Paper dimensions, which I had been doing for 10+ years, to do my “IsisHead” Project properly.
I do believe that 3D Modeling is the way to go for my “IsisHead” Project; and, trying to do 3D Draftings on a 2D Platform like DeltaCAD 3.0 is only restricting myself. Before there were Computer Systems, 3D Modeling was only possible by using 2D Drawings that were made by hand. So, I shouldn’t be complaining; especially, since my father was a Degreed Hydraulic Engineer; and, an Expert Draftsman. I am nowhere near my father’s expertise on metallurgy and mathematics and Fluid Dynsmics.