Couldn't see any mention of this via a search but I stumbled across this site, scape-it.io which is really nice for planning out a scape. It doesn't have everything but it seems to have enough to be incredibly useful, at least for me! Looks like it does get frequent updates adding new materials/objects also.
Thought I would share it here incase others might be after something like it, really is a well thought out little app
Thought I would share it here incase others might be after something like it, really is a well thought out little app