Step 1 was to get some idea of my vision. So I took what was at hand and got it rolling just to get a feel. Now I understand where it's going. Yep for military and gun enthusiasts that is a working AR-15.
I started cutting steel for the frame and turret. Waiting on my V4 to arrive. Been outlining the programming. Until I get the V4 in hand I'm not sure if I'll bring more V4s into the mix or add arduinos. For those of you that have the v4, ideas?
For all intents and purposes this thing is intended to patrol the property at programmed times and then go into hold mode for a time to listen, watch and save battery life. If while it is holding any stationary or on-board sensors pick up an anomaly then the sentry will be directed to investigate while sending me alerts and/or video feed.
My idea is for a rolling platform (this one) and sensor pods (for lack of a better word at the moment) that are stationary but all meshed via a control server to talk to each other.
What I posted is not capable for off road use so when I get the chassis built and the V4 controller I'll post the true prototype and video the field tests (successes and failures).
Just some random thoughts;
The goal is to have an autonomous sentry that can be taken over by manual control as needed.
GPS guidance system to contain the thing within certain boundaries and for the server to know were it is in real time.
I'm a decent programmer but I need to make sure all the bugs are out before going live with an AR. (a real gun is a joke for those of you that might be worried) Possibly a paintball marker with pepper or rubber ammo.
remote charging station
and the list goes on . . . . . . .
Yes I am serious, yes I may have PTSD (at least that is the head doctor's opinion) but I'll sleep better at night knowing the coyotes and an occasional Big Foot don't get the drop on me 
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@Zap, thanks for catching that @nomad18.08, I understand and agree
If the neighbors don't complain, a good sound system with directional speakers and cool sounds might help with your overall goal.
I certainly was not offended by the AR. I have one and like shooting it.
How about a super loud air horn?
compressed air is good, just expensive to come up with the compressor that can do 4500 PSI.
Honestly, unless you are going to get within 150 feet or so of the animals, I would not use the paintballs. They are not accurate enough. I would think the sound of the robot would scare them more than getting hit with a paintball anyway. Paintballs flatten when they come out of the barrel. They are not like bullets and become really very non-aerodynamic at speeds that would be high enough for anything with pretty good fur to really feel much.
I played with just a shirt on and would get some whelps but it sure didn't slow me down.
rubber ammo would limit you to about 80 feet probably. pepper is still contained within a jel coat so it will have similar limitations to the normal paintballs.
I think at this point what I am going to do is finish cutting steel and get the frame welded. I am guessing from what I saw when I ordered the EZ-B4 that It is back ordered and may be a while to get it.
So, I'll keep waiting and read and research as much as possible here to get a head start on the EZ controller option.
Trying the airhorn, music and lights is cheap an fast to test. I can tell you this, the cows were mystified at first with this thing when it rolled up on them. the next time a few days later one of the calfs was trying to play with it. So I don't think the coyotes are going to be the least bit intimidated with just a rolling base. We'll see
Anyone here have any idea how long it takes to get the v4 now?
Standing by . . . . . .
About a month. DJ said shipping would be about a month behind for the next 4 months or so.
I ordered three cameras and one EZB(4) controller 6 weeks ago and DHL delivered the package yesterday. The controller was missing but it could of been that the packer didn't know the controller is two parts and just included the power unit. EZ Robot is sending me a replacement next week.