Not knocking what you've made, but I wouldnt have bothered with the ramps, or even the entire floor. I just dig a bit out for the trap to lie in.
The easiest way is just three bits of plank nailed together. But also to stabilise the tunnel and hold the trap steady, I use a couple of stabilising pieces, crossing the floor.
I have been running up to 250 tunnel traps over the last few years, and its the easiest and quickest method.
Just a point though, some hazel stakes (or similar) should be cut, to restrict entry.
Just my thoughts on the subject.
All the best