A small 125mm grinder is all you need.
Handy tip :- When you come to drilling all those holes for hanging all the bits and bobs, use these ….
https://amzn.eu/d/0dNqm5Kt
( 6mm std Spade/Arrowhead drill bits. £9 for 10 ) You’ll only get 1, maybe 2 holes per drill, but they do get through...