Stoker,
Thank you for your candidness and it is noted. Keep in mind also that the MAJORITY of the 2 X ? is being used for framing and will not be exposed directly to the weather. All I can say is that what ever structures I do build will be well sealed for "normal weather" but will be removed from the layout in time of rain and over winter. Essentially, they will be "fair weather" structures only and not a lot of them.
As you have raised the concern of them not holding up, here is what I have been thinking in order to protect them as much as I can:
1. lay real concrete slabs for the "structures" to sit on.
2. coat the bottom of the structures with fiber glass resin that will prevent the bottoms from rotting out due to moisture.
3. coat the entire structure with flat exterior clear coat, inside and out.
I think doing the above will provide a fairly good protective coating for outdoor usage, under good weather conditions and some "light rain, dew" conditions. I also think the fiberglass resin and clear coats will add to the strength of the structures and help prevent any potential warping of the timber due to weather.
I also intend to test using fiberglass resin to coat the entire structure. If that is can be done, and remain clear, then the weather will not be a concern at all and all structures will be (almost) 100% weather proof under any conditions. The only issue I can fore see here is the resin/clear coat "might" cause some warping of the lighter timber, only might mind you. If that happens, I will need to think of ways to ensure that warping doesn't/can't happen before the resin/clear dries. All trial and error at the moment
A little over the top? Maybe, but have you seen the price of commercial G Gauge structures?
Mate, I am NOT going to hold you responsible if what I build falls apart for any reason, including weather so don't worry or feel guilty about that - I take FULL and COMPLETE responsibility
Okay, so - how much do I want of the above (less the 1 X timber) As much as you can produce in up to 24" lengths. I buy HO scale timber in 24" lengths at 100 lengths at a time, and that makes a shit load of stuff - HO scale that is. So how about I start with this in 1:29th scale:
100 lengths (24" long) of 2 X 4
100 lengths (24" long) of 2 X 6
100 lengths (24" long) of 2 X 10
25 lengths (24" long) of 12 X 12
10 lengths (24" long) of 4 X 4
X amount of "smaller stuff" for door and window trims and for kick boards etc
The above will give me enough timber for a trestle bridge, and at least one good sized structure like a station with X amount in case of "goof ups" I think. At least this will be a start and give me a good idea of how far this will go.
Cheers mate, appreciate all of this a great deal!