Our 5 x 3 Overlap Keep it Tidy XL. Many homes need additional storage space because the garage is full, the summerhouse is full, the shed is full or perhaps you just need a decorative small storage unit for your garden. With this in mind we have the Billy Oh Keep it Tidy XL Overlap Storage Unit.. Construction. The buildiing is made from the aesthetically pleasing overlap board which is both stylish & practical & the overall construction of the building will blend naturally into your garden environment.. Treatment. To help during construction & transport to you the building has been pre-treated with a dipped, base coat, timber preservative treatment. To comply with the guarantee & finish the building in style, we recommend that a further treatment is carried out following construction, & thereafter on an annual basis, to prolong its life. Manufactured by Billy Oh.com.