Having received my 4mm scale size culvert competition prizes, I decided to set about incorporating them into my existing layout scenery, not always an easy prospect, as it's mostly 'finished' if that's the right description. I have a dam wall with overflows to a river below, and I decided this would likely be the best (and probably the only) location where it might fit in, so after a bit of thought and measuring, I started hacking things about a bit. Trees were removed from each side of the river bank, and cuts made into the existing scenic banks to accommodate each culvert, the idea being that they are used to divert flow in times of heavy rainfall (just like we're experiencing now in Derbyshire!). My scenery is constructed from polystyrene blocks glued to the baseboard (9mm ply) and coated with my usual scenery plaster, which is Wickes (other brands are doubtless available) plaster coving adhesive. I use this for 2 reasons, firstly I have some left over from fitting coving, and secondly I find that it's workable for longer than standard Plaster of Paris or similar, so more time to get it how you want. The culverts are pushed into place at this point, and alterations to the river bank sides both above and below each culvert will be needed to blend things in.