I am interested in building my own printing machine and would like to know how to get started with practical know how. Please tell a self starter just what to get?
get a cheap kit, what you learn from building it, is priceless. Then you get a better understand of the workings. I wanted to do the same thing as you, Then I weighed up the learning curve, my next printer will be a 100% DIY
I own this one, its cheap and its pretty good quality, a lot better than the cheap acrylics. http://www.aliexpress.com/item/full-Metal-Reprap-Prusa-i3-3d-Printer-DIY-kit-Stainless-Steel-Easy-Installation-2-Roll-Filament/32586716087.html
Thanks Jeff! I appreciate your info on that.
This one looks interesting, I could see a few possible upgrades, but for a starter, It looks like it has a good base http://www.aliexpress.com/item/2016-Full-Metal-High-Precision-3D-Printer-Prusa-i3-Aluminium-Hotbed-Filament-8GB-SD-Card-Reprap/32671798068.html?spm=2114.30010208.3.103.7uOuck&s=p&ws_ab_test=searchweb201556_0,searchweb201602_1_10017_10021_507_10022_10020_401_10018_10019_101,searchweb201603_6&btsid=aa3e2a7f-072b-4487-b921-6e1c5e47e3c3
This is the kit i got to start, it has a good support group and there is no end to the amount of upgrades you can do!
The Printer David Sexton posted is also another very good Printer, Great reviews on it. It also has a great group on Facebook.
http://wanhaousa.com/products/duplicator-i3-steel-frame is another good print, a bit higher on the price scale but it does have many good reviews, Its not the easiest to upgrade, well the hotend is easy. 
@Aric_Norine I’d have to say right now both are the same. However, piecing stuff together (like I had to do with my MakerFarm Air2) is best of both worlds. It was cheap (at the time) and I had most of a kit while I learned about other parts (especially rods and bearings) along the way.
But in terms of building from scratch-ish, I’d suggest something like a Mendel90.
If they want to go closer to RepStrap, then get the scrap linear frames (and steppers) from ‘Tony’ on eBay.