new to trains

i would not use plaster of paris for that. instead several matches/square dowels adjusted to support but not lift the hanging track more. then fill them with the tiny foam chippings of which i think you have a garbage bag full and/or joint compound/ drywall mud(the dowels become your guides for the perfect level) - much easier to sand.
plaster of paris will be hard as rock. and noisier. and more expensive actually

also before you do that , verify your trains pass over this hill without scraping their plows on the bottom or cars uncoupling on the crest


EDIT:
oohh!!! also don't forget to plan for expansion. it seems like you might have some room on the right (i'd put a turnout leading outside instead of that tunnel)

it is generally not recomended to do grades in such small room. but if you have to have it, go ahead. i oculdn't have lived with flat layout. from my limited experience grades are about gradually increasing and decreasing and on your picture they do seem a bit abrupt. i wouldn't go for kit. fine tune your slopes with various temporary risers - toothpicks, match sticks, dowels etc.

roadbed is going to help the smoothness, i really like mine. but make sure your slopes work first.

mburns5us said:

been playing with my bandsaw and built a dock for the lake but not sure i like it

Click to expand...

we all tend to be critical of our work. but still, lets see it