That's dirt cheap, hopefully the full set up won't cost you too much! 16mm base & 12mm adapter sounds good to me. As previously mentioned, be careful with the 12mm when welding as it may warp. We'd all be curious to see how your rat cage set up compares to the straight-up all welded approach if you choose to go that path with the second pier.
Best of luck for getting it finished for NYE!
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