I don't know the spec of battery or pump but items would be bought brand new for approx
Shurflo Pump 6lpm £75
Pump strainer £12
Controller less than £50
Brand new leisure bat 110ah £85
Bits of hose an clips £10-15
Small strong stack and store box £10
There not a massive difference in price
I use dubilee clips on my hoses, u can't tighten them enough using a screw driver but by using a socket allows u to fully tighten them so there's no leaks,
I have my pumps screw into the bulkhead at the bottom in the gap between the tank, run hoses round the back and through Di.
I always try to maximise the space available