Looks like you've found a new source of income. IF there are enough Gen1 bikes in Oz (to start with!), you can make money with this. Streamline the production a little, get some better tools (to cut on time needed), drop some advertising, start making them for other bikes too. Advertise (in the beginning) "two-three" weeks for delivery (or as long as it takes you to make it!). Don't quit your "day job" yet! Make these in your spare time, and advertise accordingly. Once the orders pour in (and you get too busy), quit your "day job", rent a building, hire two guys to make them (you supervise, do accounting, advertising,......).......you got yourself a nice business!
Five-six years of that,.......sell the business, and do something else (another business, another idea), or.....find a struggling business, figure out why they are struggling, buy it, change it around, double (or triple!) the production, and ....sell it (well, that's what I did, and it works!),....trust me.