Thank you everyone for your very nice comments!
@Opa and Thorulf
I\'ve thought of making a union one as well with a wagon for the telegraph or something. A Balloon is also a great idea!!
@Don Voss
Yes they were so large as Thorulf kindly showed. They did need to be seen clearly from a distance.
@Robert
The state of vegetation would depend where, when and how the platform was constructed and for how long it had been standing. If for example they built the platform from the trees immediately at the spot of construction for say a hasty set up then yes it would be pretty clear of vegetation as you said. However, let\'s say the holes were pre dug and then logs brought up from below and inserted in holes like this one and the platform had been in service for a period of time say like observing key roads or such then a good amount of vegetation is not only plausible, but reasonably likely.
Christopher