Does the tank have any protection in the event someone attempts to drill a hole and attach a towel rack etc to the other side of the wall?

Not that I remember seeing. The frame around the tank is nice and sturdy but I remember the tank being somewhat open. We love ours. It was very difficult finding a plumber who could take on the challenge but once we did and got it installed, we were very happy with it. Because we were working with in such a small space, we had to pack a lot behind that wall (there were electrical wires and outlet boxes, etc. as well as The tank and pipes for the sink) so I would not even attempt to hang anything above my toilet! (Other than something that could stick on the wall.) Anyway, Good luck!

Whats the drill size to fit a drain pipe on a 2x4 frame, without expanding the 2x4 wall frame??

3-1/2" hole saw. That skims the edges of the 2x4 plate. I ran a guard strip on both sides just in case, even though I did the work and was aware when screwing in the sheetrock.

What size are those 2 rods ?

It's not clear what you mean by '2 rods', but here is the specification sheet for this carrier - https://www.geberitnorthamerica.com/local-media/spec-sheets/gna7225-111-798-00-1-spec.pdf

Manufacturer	Geberit
Part number	111.798.00.1
Item Weight	4.54 Kilograms
Product Dimensions	2.54 x 2.54 x 2.54 cm; 4.54 kg
Item model number	111.798.00.1
Size	Small (19 3/4" W)
Color	Blue
Style	Toilets and Bidets
Finish	No Finish
Material	Ceramic
Shape	Rectangular
Installation Method	Wall Mounted
Item Package Quantity	1
Specific uses	Inside
Included components	Product Only
Batteries Included?	No
Batteries Required?	No

Geberit 111.798.00.1 Toilets and Bidets

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