Top painter Darren Linington, has put together a little guide to making trees in response to lots of questions about his basing of the Brian Boru model.
You can download it by by going to Brian Boru and clicking on the Downloads tab.....
https://www.grippingbeast.co.uk/SHVA13_Brian_Boru_First_High_King_of_The_Irish_1--product--5163.html