I made this one from Balsa and soldered the chassis myself.
The price of the components is not to much.. scratch build body with scratch Brass chassis Pitman 196B and Weldun Bevel Gears etc,
wheels are PCS 32 24x6 Classic Spokes from Pendle Slot Racing.
The Driver is a resin cast from Immense Miniatures which I sanded and shaped and painted, it came with different types of era heads
The toneau cover is made from my son's swimming pool vinyl, then painted with Humbroll matt enamel black.
The mirror is a bit of filler shaped as a mirror stuck on a needle then painted silver and has Alu foil on the mirror side to replicate a mirror.
Front metal window support is made from a needle bend like a staple and the window itself is made from transparent package material.
All in all the costs are not to high but the sheer amount of work to carve sand and prep the body, and to design and build the chassis makes this pretty invaluable to me..
That and it being my first Balsa car.... 300 would not be enough.