Tinker welcome to Rotorheads and I hope you soon get to fly in a helicopter.
There are specific requirements governing public use helipads and heliports but, it is a little different for private sites and I am not entirely sure of the applicable legislation. Hopefully PPRuNer JimL will be along and be able offer some clear guidance.
In the meantime if you have a plan of the area (with measurements) and with a sketch of the proposed woods, and if you can post it, you may well receive some comments - especially if there is anything obvious which 'sticks out'
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