Roy wrote, on Mon, 16 Feb 2015 11:47:50 -0800:

I saved a copy of all of those pictures in case I need
a "before and after" scenario...but seriously I hope you
succeed in your project.

Thanks for your well wishing.
It is one of a kind, so, we're learning as we go.
In the end, it will be pretty neat though, don't you think?

It a 10-foot wide suspension bridge, which starts at ground level
on a path in the redwoods about a thousand feet (or so) from the
nearest anything, and then goes for about 70 feet to a large
second-growth redwood, where the deck expands to 16 feet wide.

Sitting on the wide decking, about 40 feet above the ground, will
be a two story treehouse, with a bathroom, kitchen, electricity,
gas heating, and WiFi Internet (which is something we're experts
at by now, given that we all maintain our own radio antennas).

We're thinking of suspending the treehouse with 1/2 inch cable
wrapped from the big tree to the two smaller trees cradling
the bridge at about the half-way point that you see to the
right in this picture.
https://c4.staticflickr.com/8/7284/1...14ed76cd_b.jpg

So, that way, the treehouse and the suspension bridge would
be, in effect, supported separately (or we might make the support
mutual and redundant). We're also thinking of adding downward
hanging support cables, again from the smaller redwoods to the
decking, to add redundancy once the treehouse weight goes up.

One problem we have been having is we have had to constantly
adjust the tilt and leveling of the bridge, as weight was added
to the end. We ended up buying a dozen cable winches, which are
what is holding the bridge up now, one of which can be seen in
the left in this photo below.
https://c4.staticflickr.com/8/7414/1...ca7a421f_c.jpg

We also may erect a few more nets so that we can walk out to
the neighboring trees. In fact, if you look closely, you can
see two different nets in the picture above. One is to the
top left of the picture, and the other is in the center right,
in the big redwood tree itself, where someone spent months
sleeping in and writing a book, many years ago (his net is
still there, 40 feet up in the tree; but we would replace it
as it's not safe to use probably, being fifty years old).