Marshall Sholtz: from facebook oct 4, 2018
i haven't, (though have one mostly finished) but as the mystery machine raced in milwaukee, the bom is probably   * ~$300
  * $25 alternator core
  * $29 motor controller
  * $4 buck converter
  * $123.76 battery /2 = $61.88
  * 1 2x6 = $5.47
  * 1 2x4 = $3.57
  * $11 sheet plywood
  * $50 for 4 tires
  * 4x $5 rims = $20
  * $11 belt
  * $ 5 alu motor pulley
  * $ 5 hardboard rear sprocket
  * 2x $3 weldable hinges = $6 (steering hinges)
  * scrap metal???? $20? - steering ,shaft coupling
  * ~$10 farm&fleet hardware by the lb
  * rear axle $15?
  * 3x p5/8 pillow blocks = $7 = $21
  * 
  * so approximate total bom for mm milwaukee = $303

If you want to buy it for $500, go ahead. I think Id actually be pretty ok with that.