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Hello and welcome, R2 and R3 curves are 17 1/4" and 19 7/8" respectively.  Depending on the equipment you are purchasing/have already, you may run into difficulties with one or both of those radii.  R3 is less problematic than R2.    Peco Short Radius (SL-91/92) turnouts are readily available in the US.  Their diverging route radius is 24" which is much better suited to US prototype HO scale models.  Length of the turnout is 7 1/4" vice 6 9/16".  They are not a direct drop in for the ST-240/241 turnouts, but they are pretty close.   For crossovers between tracks you may want to consider a PECO Medium radius turnout as a minimum.  These tend to work satisfactorily for crossing between tracks at a relatively slow speed.   Atlas code 100 Flex track would be a cheaper option for the straight sections.  I used Atlas code 100 flex with my Peco code 100 turnouts without issues.  You can then trim the flextrack to fit.    As far as settrack goes, 18" and 22" radius is likely all you will find from US manufacturers.  As far as workability of the track plan, you may find that there are several areas that will cause you some operating issues.  One in particular is the S curve caused by the crossover at the top of the layout leading into the roundhouse track.
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