I was, for a long time, bothered by making my own proper bulldog nose engine that I would like (with most of the prototypes I made, I wasn't satisfied at all)
So here is The Black Hornet bo-bo engine unite combined from A and B unit (A-unit sadly not good with connectors, so iconic a-b-b-a not an option for this model)
And yeah, it`s empty /shell/husk for different kinds of motorisation (possible). I hope BL won't set it as an IP violation and lock it.