Toy Train Storage, or matchbox car storage. , These are ikea picture ledges and I thought this would be perfect for all of your boys!
Kinderzimmergestaltung-Kallax als Spieltruhe
Yasssss for my boys bedroom
Children's Bed - Looks Like A Little House Headboard . instructions seem to be in Dutch, you can try translating it into English but you get the idea for a cute bed that you could copy from the picture and the dimensions of a twin size bed.