Lovely little chop, wonder who made the frame...
Almost tempts me to try building one sometime (if only there was time

) wouldn't worry too much Bruce, stock XBR engines only ever made 35hp or more in Hondas literature (with the possible exception of the ones they gave the journalists! Either they were talking rot or they had specially prepared XBR's with different engine internals!) 32/33hp is doing well for them.
I haven't ridden a hardtail chop, although I know of a couple which have done huge mileages (with way more powerful engines). I assume you just have to ride cautiously in some circumstances?