What scale length do Mayones use for their 8 string guitars?

Mayones 8 string guitars go for the baritone scale length of 27".

What type of neck join do Mayones use?

This actually depends of the model. For example, Duvell and Setius models have bolted on neck joints whist the Regius models employ through neck construction.

Can I order Mayones guitars through guitarguitar with different colours to your stock guitars?

Every Mayones guitar we stock has been custom commissioned by us. If you see a model you love but would prefer it in a different colour, it is almost definitely possible: just talk to our staff about buying a pre-order and they will guide you through the process. It won't necessarily cost more either since all of these guitars are essentially custom order anyway. However, prices will change depending on the features requested. Please talk to any member of staff for more details.