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I followed all the steps you listed and applied the fixes. Now it loads both standalone and imbedded.
The SYS_DIR sets itself to /usr/bin so i changed it in ncam.py to be "/usr/share/linuxcnc/gladevcp/NativeCAM"

In lathe everything works except change tool and straight turn. When I select these icons they give the following error:
File "/usr/bin/ncam", line 4955, in add_feature
f = Feature(src=src_file)
^^^^^^^^^^^^^^^^^^^^^
File "/usr/bin/ncam", line 1736, in __init__
self.from_src(src)
File "/usr/bin/ncam", line 1864, in from_src
exec(self.attr["init"])
File "<string>", line 2, in <module>
NameError: name 'parent' is not defined. Did you mean: 'reparent'?

Any idea how to reslove this is appreciated. Cheers

Where would I find this?

Has anyone used this to make a GUI similar to mini (deprecated several years back) or something similarly simple.

Do you have any other older PC?
You can install everything on another PC then move the drive to the machine PC and it just works 98% of the time.
What is the PC make/model?
Try pressing F12 for Dell (F8 for Asus and F11 for some others) with the USB inserted and right after powering on, see if it shows a bootable device list.
Try a different USB, i refuse to believe any PC after roughly 2002 will not boot from USB, even earlier PC's mostly boot from USB without issues.
Is the HDD a PATA or SATA?
PATA = 40 or 80 wire flat cable
SATA = small connector with thin wire, usually black or red color.

Disconnect the power form all but one drive and do some tests, then connect another one and test...
I am pretty sure it is an interference issue with bad wiring and/or bad grounding, so u7pload some pictures of the wiring here so we can have a look.

Anyone have any more suggestions on what I can check/try?

I am now on 2.7.14 Wheezy, Dell optiplex 9020, Netmos9900, and latency under 6k. The stepper will jog and then quit working shortly after, regardless if there is "pausing" or not. The PCIe parport shows "disabled" in lspci -v, and even if I enable it via the terminal, the stepper still doesn't work unless I reboot.

Any ideas at all are appreciated.

There is nothing on the Hard Drive except Ubuntu