Thanks all.
Decided to get an Ro/DI now as opposed to later.
Re timing.
Have no plans to add fish until its cycled. If at the 3 month mark I have a couple I'll be happy. Im really in no rush and want to take my time, even deciding what fish when I feel I can +1.
Re 60pds LR.
Have it in my mind that number is just to start. Im a bit of a tinkerer, when I did my Koi pond it was months before the 2 tonnes of rock had found its finally resting place. So 60pds now see how it looks and then once I have the shape I can add more if desired, or as mentioned the sump (hadn't considered that..thanks).
Thanks for the cure tip

. Its all being delivered same day, so while plumbing and hardware isset up is occurring a bath/rinse/baste

in some prepared water?