A job and a half

These are my dad's slides. At least my first few years are in there. There are bloody hundreds, actually probably more than that.
I don't really know where to start with them and put them up in the loft today. We got them out of my mums loft, er, oh wow, nearly 2 years ago.

They nearly killed me on the way up. Slight ladder wibbling over under my feet when I was stood on the top incident.

Anyone with any recommendations as to how I can preserve them is very welcome to
comment. (I know loft isn't great option but I can't trip over the box any more)
The only slide converting places I've seen charge a fortune. Not sure about buying something and doing it myself.