hi,if you're going to use custom scenery I recommend to play with the 2 expansion packs ;)about custom scenery:If you have enough experience in buidling scenery with custom themes I would suggest you could use themes that use small blocks, bits and pieces etc.. like lampies theme packs or something like that so you can make various things with it.For large objects ? I don't really know but maybe just use something from rct2 original.About Scenery Layout ?What do you mean ?how the park is going to look like or .... ?Kind Regards,zionmees