[Arran]

The wood on that one looks more of a medium walnut colour, though I don't know why. Both of my 46-350s used a blond hardwood, probably maple or poplar, and it was all consistently yellowish like a hardwood floor. What happened with yours I don't know, probably the cabinet shop used whatever wood they had laying around and didn't worry about matching species or colour too closely.
As codefox said these typically used a rectifier tube, a 117Z3 in both of my 46-350s (actually one is a Canadian version, the model number escapes me).
I would stick with the 117Z3 unless you really need it to be instant on, but the tube rectifier does offer some cushioning on power up. There were plenty of portables that used a selenium rectifier, but they too have more of a cushion and a forward voltage drop then a silicon diode, so some re-engineering is in order.
Regards
Arran