Bike porn

dude, if are riding your bike, you gonna fuck up parts after a while,
saddle too and different saddles have different height, so if this plastic
SLR (or what ever it is) is fucked up , you will have not many options
for a saddle to get the same saddle height.

but all theoretical shit, don't think that the owner is gonna
really ride this bike...

You clearly have never looked at a frame with an integrated seatpost close up, have you? The concept is very similar to carbon forks, i.e. you use spacers to give you a, admittedly smaller, range of adjustment.

I've a Ti frame with one and there's plenty of scope for adjustment using spacers and the micro seatpost that the saddle's attached to.