I can't comment your design but can share this for others who might be looking for cost effective deer fencing.
When we fenced in our 100 foot garden money was a concern and deer are a huge issue here. So, I read a bunch and tried the following (deer don't see well which is an important part of why this seems to work).
We left the corner posts 8 feet tall. The wire fencing on the bottom part of the fence is only 4 feet high but for the upper 4 feet I took boundary marking tape (old vcr tape also worked) and ran to it from corner post to corner post back and forth. It makes it look like the fence is 8 feet tall but it is really only four feet. I also hung streamers off these lines that flap in the wind. The deer think this is a really tall fence and I have had ZERO issue with deer in the garden unlike the orchard right next door which has 6 foot tall traditional fencing. The garden fence was even electrified and we have had no need to turn it on thus far in 4 years.