Indeed, it is the Yamaha DT50 RSM from my son.we bought it second had but the electrics where very bad (actualy completly gone) so we are rewiring the complete bike from scratch.
The dark tiles are slates (the previous owner put them in) but I prefer polished concrete because it is easyer to clean.
The polished aluminum came out great, but it took some work. Originaly there was a few mm of body filler and paint on it so beadblasting, some sanding and 2 hours of polishing.....