Tree spacing in food forest/windblock

Hi there, newbie to the forum here, hope I'm not breaking any rules by jumping straight in to post here. Just had a question: my husband and I are building a windbreak for an area close to our house, which is open to the north--we get pretty brutal windstorms here during the winter months, so we're just trying to mitigate some of that blasting cold air. We have hugel beds that we built this week, I have already planted 2 pears and 2 hazelnut trees, and plans of bringing in elderberry to plant as a hedge a few feet further to the north... My question is, I want to plant in some chestnut trees as well, and I wonder if I need to space them as suggested in a traditional orchard-style planting, or can I plant them closer to my already-planted trees (say, within 2-3 meters) without future need for excessive pruning or relocation? If the idea of a food forest is to imitate a wild forest, wouldn't this be a more accurate replication? Does anyone have experience with this? Please forgive me if I am asking dumb questions here. My husband assures me that it will be fine, guess I just wanted a second opinion before I set us up for a lot of transplant work a couple of years down the road. Thanks in advance for any advice you can offer!

Hazelnuts have a spread of around 4 meters so I wouldn't plant anything closer than 2m and remember you have to allow for the thing you are planting as well, so if you wanted to plant an elderberry next to a hazelnut you would need to leave at least 4 meters between them more would be better as when both are mature it would be very hard to get in there to harvest. If you are planting a windbreak hedge then you can go closer in a row (1m ish) but you will still need to allow space infront and behind the row for access, light and room to grow.

How close you can go to the pear depends on it's rootstock if it's dwarfing then putting a similarly small tree 3 meters away would be fine but if it's only semi dwarfing then 5m would be the gap, and a own root pear would need more space again.

As to Chestnuts, these are big trees and fast growing (20-30meters tall) they certainly cannot be planted 2 meters from anything unless you intend to remove the things you plant near them in 5-10 years.

At minimum spacing you won't be able to grow much or anything under the trees either, if you want to plant other plants in among them then you need to space things out further to allow light in and reduce competition between the plants.

Thanks Skandi, I appreciate all of the info. Helps to confirm what I had suspected. It's difficult to figure these things out, having never seen a successful food forest in person--the ideas are talked about a lot, but it's not so easy to find practical info on concerns like spacing. Now I'll just have to find a way to plant the chestnuts in another space where my goats can't get to them. Bad habit I've gotten into, buying trees with no place to put them! LOL not the worst way to use paper money is it.