Forest/pasture spacing plus rotational grazing plan.

Hello, I have some land in Montana that is fairly steep and currently mostly wooded with fur and under story brush. My plan is to thin the furs and inter plant with nitrogen fixers and fruit/nut plants to makes strips of forest on contour with pasture in between. My question is how far apart should I make the forest rows? I think in the hot drying summers some shade would really help the pasture but don't want everything so close that I lose pasture production. Not sure if I should start a different thread in the cattle section but here we go anyways. I have attached an photo showing my planned lay out. Green is road and planned buildings. Blue is natural water. Red was my proposed lanes to let the livestock to water with rotational grazing perpendicular. Total Acres is around 7. Any Ideas? thanks

I'll try and help but don't have real experience on this topic, my knowledge has come from reading a bit.
First knowing it's steep land for sure I would leave a larger forest strip to help the soil be protected from erosion.
Second the width of the spacing between the forest strips is directly realted to tree height, and sun orientation. I would calculate the shadow the trees cast and see that the shadow of the last trees from the first row touch the base of the trees on the second, but you have to think always of the erosion posed before.
oreintation east/west if it is possible can help somewhat with the spacing being you gain more light in the alleys and can have a good yield from what you seed in the alleys.

I tried hope it helps you a bit. search on the web something about alleycropping in agroforestry or similar some ideas may come up