In this photo you can see that I've extended the 1/2" sheet foam for the initial portion of the main part of the layout where the track remains level. Following that there is the first section of foam incline material which introduces the initial 1% grade transition. This first incline section was made by stacking (and gluing) a portion of 2% incline on top (and in reverse) of a 3% incline piece to effectively get a 1% grade. Care had to be taken to make sure that the mating edge to the level foam started at 1/2" in height and I only glued the mating vertical edges (between the level sheet and incline riser) together at this time to allow for the riser on the right to be flexed in the direction I need later when following the track route.
Here the next section of the incline can be seen as it is being built-up. Only the first 3 inches of the incline has been prepared (seen pinned down while the glue sets) by stacking a 2% incline section on top of 1/2" level riser. The remaining portion of the 1/2" riser will have some 3% material stacked on it to ultimately reach my next grade transition planned for 21 inches from the initial start of the 1% grade (and running total elevation of 0.56", or about 10.25 scale feet).