I'm on a small island I found and extended a little bitI'm also debating whether or not I should live in a shallow cave? any answers would be appreciated :)
The proper name of the tool is EMT (electrical metal tubing) BENDERSpring benders are available and I have used them on copper, but EMT is harder than copperThey might work on aluminum.
looks like you need a 1/2 inch conduit bender
put it in a vice and bend manually with a pair of dikes or clamps
I'm not sure of what a water lance is, but at any hardware store you can find a tubing bender in the plumbing sectionA tubing bender will not typically work for tubing larger then 5/8 ODIf it is large then that, call an electrician and have them bend it for youThey have the tools to do it, and I would venture to guess most would not even charge you if you took it to their office.
I always make my house out of wood to startI have a small front yard and i have a cobblestone foundation 1 block highIts a 2 story house also with library and kitchen with a indoor swimming pool because i was bored:D But it really depends if you have a mine and how deep it isMost of my floors i made marble just because i like the look of themI also made two teleporters in my house acting like an elevator If your just starting then i would cut down lots of trees and make a wood house, then as you progress in the game you could add in swimming pools, a library, kitchen, entertainment room, storage room for all your blocks you mine, maybe with little signs above telling you whats in themYou can do so many things, even pointless things like i built a Airport runway for my house with a helicopter pad on my roof:) Hope i gave you some ideas on how to get started and what you could do! Have fun