smiles and thank you,
I design problem solve as a job, well a big part of it is solving problems,
I have in the past spent a lot of time dealing with trampoline related issues, from placing them into steep hillsides, building them into the ground, and concealing them for neighbours, for clients, creating access,I've even put them in ponds and pools.
If you have a massive farmers merchant something like mole valley which are a charity so cheap, they have a very large selection of cattle water troughs, and feeders, which do the job nicely, if you want "new", I use them as ponds, far superior to anything else available for ponds.
I've used IBC tanks with the tops cut off, then cedar clad the cages they come in very high end finish, but you could easily clad them in anything as long as the light cannot get through (you can get black ones, but as people like them for water, they usually go for £30/£40),
you can get them for £20 each, you don't need food grade ones if you are growing bamboo in them, you only need food grade for water storage, or growing food, they jet wash out well.
If you use IBC tanks, some people on ebay are selling them in pairs as two go on a pallet, but if you look someone very near you will be selling and delivering them locally, as they are used for everything, it use to be companies paid to get rid, now they get sold on.
It's also quite cool jumping on a trampoline surround by bamboo so children like it, as long as they have nets then it's never an issue, and you never have to buy canes again.
google IBC tanks for sale(name of area), and see if there is someone local to you, if not gumtree, ebay.
but keep them off the ground, enough so you cat can get under, that way nothing takes root where it shouldn't.
I also run a hose with holes in, through each tank near the surface under a mulch , with a hozelock connection at the end, so when they need watering, you connect the garden hose and leave it running, for a few minutes.
my garden is on a rainwater harvest irrigation,I haven't got time to water, I always put in a simple system for anyone when we add plants as part of a design, so that they do not have any added work load,