I know you are going to think I am commenting for all the wrong reasons but I would just caution against pallets, a quick search on the web produced this.
“Newer British, Canadian and American pallets, for example, are largely safe as most are heat- or pressure-treated rather than being fumigated with chemicals. Pallets must now have the Integrated Pollution Prevention and Control (IPPC) logo and are typically marked with a country code, unique number and either HT or MB”
Most UK pallets are safe.
Most of ours are fumigated.
The untreated ones generally have no markings.
The advantage would, apart from cost. I remember reading a piece on a study that showed the benefits of leaving the inside of the hive as rough sawn, apparently bees preferred it. Anyone remember seeing this ?