Hello Randolph.
2 x 1 minimum for the frames with 2 x 1 cross supports about every 18". Sundela isn't that strong & tends to warp a bit if there is any kind of damp. I would only use 1 x 1 if I was making an exhibition layout which needed to be light. If the layout is permanent then the thicker the better.
I am using 3 x 1 on my layout but then it will never be moved,at least not in my lifetime.
2 x 1 support around the wall will be fine unless the wall isn't paticularly strong in which case I would use 3 x 1.
Make each baseboard up seperately so that you can take it apart if & when you need to move.
Set up each board with legs as your floor may not be level in which case each set of legs will be a differant length.You can also get ajusters which fit to the bottom of each leg which means that you can ajust each leg to match the floor level.
Baseboard height is a matter of personal preference. In the US they tend to be higher because modellers over there prefer to have the layout at eye level. In the UK the layout heights are lower but what matters is what you want.
Get yourself a good spirit level & level everything.Nothing is ever as straight as it seems.
Hope this is of some help to you.If you need more help there are plenty of people here only to willing to give of their advice.
Most of all "Have fun" Take your time. It's not a race. You do as much or as little as you want when you want.
QUOTE (randolph @ 13 May 2008, 08:54)
<{POST_SNAPBACK}>I am currently building an OO gauge layout. It will run around 3 walls for a total length of 7.80m and extend into the room 0.90-95m. My plan is that the baseboards will be made of 2x1 and 1x1 (sorry its inches) overlaid with Sundeala. The baseboards will be either .90x95m or .90x.60m and held together with coach-bolts. So far so good, the bit I need advice on is:
1: Supports for the baseboard - I can put a batten around the walls and rest or screw the baseboard to it. If so what size wood should I use of this, my idea was 2x1in but 1in seems a bit narrow to have to screw into against a wall. I then intend putting 2x2in legs around the outside at each end and across each baseboard join.
2. I don't intend moving the layout until I move house. So is it best to set up the framework first and then fix the Sundeala afterwards or complete each baseboard with Sundeala before joining together?
3. What height should the baseboard be above the floor - is there a rule of thumb saying it should be so far below eye level or is it just personal choice? I intend to sit and operate the railway with an eye height of 1.20m.
I would be grateful of any suggestions or criticisms of the above as this is my first layout!
Thanks R