Yes Greebs, Johns method is the way I am going to go, don't know why I didn't think of it actually, probably cos I'm a bit thick

I don't think I'll have the dividers to slide out though, I will just have them to slot in at the bottom and raise into place. I have used this method with my 6 footer and it works pretty well.
Thanks to you all for your assistance and advice in this

You're not a bad lot