I searched all over the internet but can't find anyone who has done this before. I'm moving into my friend's small guest house (it's basically a 10'x10' shed), and want to sleep on a twin bed to save space. However, I had the idea of using a sort of trundle and a second twin mattress to make a full-size bed for when my significant other sleeps over. All of the trundle beds and DIYs I've found all have the beds separated, one up high and one on the floor. Obviously, that will make things a little awkward for activities, so I'm trying to figure out a way they can both be on the same level.

So far, I figure I'm going to have to build some interlocking bed frame that can slide apart without actually coming apart, and I also want it to be a good 3-4' off the ground. I'm picking up a used wooden twin bed frame (ikea) that will hopefully give me a good starting point at least.

I'm just curious if anyone has ever tried to do this or even seen it done, or any advice that might be helpful. Thanks!

I'm looking for a BIFL daybed that can be converted into a king sized bed by pulling out the trundle portion or the trundle can be used as a seperate twin. Storage drawers would be an awesome bonus but not necessary.

IKEA seems to be the only place that even really does day beds but I know their beds can be iffy. Bed would be for family kids to sleep on, or an adult guest bed if needed which is why I like the two twin/king bed idea but mostly will be used as a sofa/reading spot in my office. Also considering a futon but that would only be one bed and also not bifl.

Failing bifl standards, has anyone made one and have suggestions for where I could get plans to build my own?