Electric chicken fencing

[FD3Si]

So, the neighbourhood gingers proved prior to christmas that poultry is the meal du jour. Unfortunately, since then our two remaining ladies have had to stay locked up under wire as a result. Which I don't like at all.

We already have electric netting, but the energizer was knackered, so I've bought a new mains powered one. However, to be honest it's a bit of a PITA and I'd much rather set up a more permanent affair.
So, I'm thinking of using chicken wire to keep the birds in, and two/three trace wires to keep marauders out. One at about 6", and one at about 2ft. Plan was to support the chicken wire on round posts.

Sound like a good idea?
If so, a few questions:
1: what sort of height do I need to run the chicken wire to? it's for containment, rather than protection, and we favour fat useless fliers with clipped wings. I'm thinking a 4ft fence should do it?
b) With that in mind, 1.5m stakes ok?
iii/ Should I probably run another trace wire at the top, as well as an additional earth wire, 'just in case'?
-. How far apart should I space the posts?

I know that a ginger beast can jump a 4ft fence, but it's my understanding that by baconizing the trace wires, they'll learn to stay away...

Enclosure will be roughly 30mx10m. One side will be a 6'6" feather edge board fence - I plan to run an earth and hot wire across the top of this.

Cheers