Here is my daughters "Big Girl" bed, she LOVES it, and wants to go in there and pretend to take a nap a couple of times a day, bounce on the bed and generally play. It was a labor of love for sure.
I found the plans on Ana White's website it is a Full size Farmhouse bed but you will need to look at the queen bed plans as well for some of the dimensions. The trundle was built using Ana White's trundle plans and we bought a new full and twin mattress for each respectively. The trundle was built using the entire plywood piece instead of cutting it to the twin size and my husband added a wood divider along the inside length of the twin bed so I can store shoes, winter clothes or extra bedding in there for my daughter. At points during construction she liked laying in the trundle storage space and "hiding" from us.
The bed was a definite labor of love it took us about 2 months total to get it finished in between all of the other things we were doing.
I used silver cup pulls for the trundle and it is on casters rolling on the floor not attached to the sides of the bed base which is nice.
I love how colorful and fun this room is and so does Karsyn.
I sewed the trundle comforter cover (more to come) the quilt and pillow case covers.