Hello All....This may seem like a dumb question but I am going to ask it anyway. I bought my grandson a new train set that came with a bridge and plastic risers to make an elevated grade. What I want to ask is, if I decide to continue the grade to make it longer and therefore higher (hope this makes sense), can I just measure what the difference in the height of each plastic riser and make wooden ones to continue from the two highest ones? As I said, we want a longer elevated track. Also, if I did this, woul'nt the grade still remain the same as if I just used the plastic risers as they came with the set, without my modifying them?