How to run a Hackintosh MacOS Sierra on a USB drive?

Hi there

I'm trying to install a copy of the Sierra Hackintosh not on a Hard Drive but on a USB drive.

Here's what I'm using:

Laptop: Asus / Intel Core i5-3210M 2.5GHz / Nvidia GeForce 610M 2GB / RAM 12GB / SSD 500GB

USB: Kingstone HyperX Savage 64GB

What I did:

I followed the guide (Hackintosh Zone) to install it on a HDD and there a USB is used to install the OS on the HDD. That's why I'm using another USB to install the OS on my USB HyperX.

To install it I plugged both the USBs on my laptop and then completed the installation process installing the OS on the HyperX.

After that the laptop restarts, but if I boot the HyperX alone it will tell me to reboot using a proper boot option.

I checked using TransMac if the USB actually has the OS installed in, and it does.

So here's the problem:

Can I install the Sierra Hackintosh on my USB drive? How can I boot it correctly? What's stopping my USB to run with Sierra installed?

I'd like to be able to run Sierra by just plugging that HyperX onto any computer.