One issue is with using smaller wheels on a frame designed for larger ones . Will the brakes reach the rim? Disk brakes could be a solution but then cost becomes the next issue. Building a Minivelo in Canada is $$$. My estimate is at least about $1000. A v Orange Nutrino will be about $2000. The frames have to be imported. There in one on sale in Montreal on Kijiji. It looks like my old Fuji. It has 451 wheels. Winter tires won’t fit but its a nice Minivelo at a good price. I do have my Lombardo 2000 Minivelo frame with all the parts that I’m thinking about maybe selling. Maybe tds101 who posted above has his for sale.