With a bit of research and some wood......POOF A "Ramp".

[JaTexas]

Note the ramp pitch...The ramp is very long but it will extend into the run as soon as we build that part. I used wood that I had and will paint it green.

 

[Mouthpear]

There is always a few things about ramps that I always recommend.

• Removable or hinged or Hinged & removable. Very helpful when you are in there with them and have to move things around and maintain.
• They are not really needed for the most part. They don't need help getting up on the roosts so why need a ramp to get in. They are more to make us feel helpful ( I think ).
• If you are going to put a ramp add more slats for grip. Or use some stair grip tape, Or take a circular saw, and set the blade to something like 1/8th inch deep and kerf the board at a 45 degree angle both ways and make a diamond pattern. Their little claws will be able to grip easy

Just an example.

All in all it looks great. Be nice to see a few pix from further back.