A custom bass configurator where the constraints are sourced, not guessed. Every option it offers you — and every one it quietly takes away — traces back to a measurement somebody actually made.
A 30-inch scale five-string is perfectly buildable. Nobody makes a low B that behaves at that length.
Most configurators will happily sell you one anyway. RootFifth tells you before you spend the money.
Get told when it opens
One email when it is ready. Nothing else, ever.