when you relocate your canister, be sure to use either a true multi-purpose hose or fuel/fuel-injection hose so that the vapors don't eat up some of the other types of rubber hose. when i relocated mine i was concerned that the time to pressurize the system during the self test might be off and throw codes due to the increased volume of the system with all the extra hose, but there were no issues.
on the hot water system, PEX wouldn't make tight enough turns for me so i used 3/8 braided clear tube and barbed fittings even though i usually hate hose-clamps. it's at the upper limits for temp rating of that hose, but it's holding up so far. the only problem was that it get soft when hot, so i had to significantly re-tighten all the hose clamps down on the first use once there was hot water flowing through the system - since then all good. however, i'm currently using a jerry-can for water source and plan to eventually re-plumb everything based of a permanent tank - so i'm eager to see what you use and how it works for you.
good luck, and nice going so far!