A firm foundation

The vertical section of each L-girder is a length of 3in x 1in
planed timber, to which is screwed and glued a length of
2in x 1in.  The wiring goes to the control panel  and will
eventually be tidied up, though there's a lot more to
come yet.

St Petrock's baseboards are constructed using the L-girder principle, which is well described elsewhere on the Internet, so I won't go into much detail here.  L-girder construction is often used to create an open top in which scenery can be lower, as well as higher, than the track base.

The station area at St Petrock, however, is basically flat, but I still favoured L-girders as they form immensely strong baseboards that don't need closely-spaced legs to support them.  My baseboard legs are 7 feet apart, leaving plenty of under-baseboard space for a folding double bed, a freezer, two nests of file drawers and all the clutter that inevitably finds its home in my railway room, whilst still leaving space for me to crawl around installing wiring and turnout controls.  The whole thing is overlaid with ½ inch chipboard or MDF, much of which was salvaged from an old wardrobe.