My first syntropic rows were too wide and not enough space between the rows, it's much more adaptable to have 4m between the rows, and then if you choose it is still possible to alley crop, run animals or cut hay/bio mass .
The width of the rows should be as narrow as it is practical to cultivate, I now choose 60cm width because my broad fork is 55cm wide .
Narrow rows save time weeding and can always be widend after a few seasons of mulching. My planting density is about 40cm, which again saves on weeding, economising on planting density is tempting, but in the end slows the system and makes more work, if there's not enough to fill the row, push cuttings in the gaps after a bit of experience you get an idea of what roots easily. There's always comfrey or something similar to fill gaps where plants fail . Making a mother row of plants to propagate from is a good investment, when you become experienced in multipling these, the extra plants can be exchanged for new members of your mother plant community or sold to raise revenue.
My first experiments in syntropic planting were more of a hybrid between traditional landscaping and forest gardening, both of which I know well, now I find it pays to be committed to getting the planting correct because the speed of establishment is considerably better/quicker when you get it right .