I am not a carpenter and this was my first attempt....you may want to put some slots in the solid wood panel under your bed. This will reduce the chances of your mattress going mouldy. Or just air your mattress outside occasional. I work in a bed shop and mouldy mattresses can happen quite quickly with moisture and heat.
These bunk bed are very cute and uniquely designed. The only thing I would do differently would be to put a larger mattress on the top bunk that fits the whole space. Charming Vacation Home home interior design Boston Transitional beachy bunk beds Built-in Bunks fun bunk beds girl bunk beds lofted bed roman shades triple bunk beds twin beds