All depends how much work you would like to do and how much you want to spend.
Alloy rims; you can use 349 brompton alloy rims or the SUN CR18 rims, Alex rims, Velocity rims are also available.
Tyres again there are many (16 inch) 349 tyres available from the raleigh originals, to brompton tyres, Schwable, and my favorites the Primo Comets.
The hub may be fine but if its the one that was used on the Moulton MK3 save yourself the trouble and don’t bother. The hub oil leaks into the brake area and you have no brakes!! Tektro make some very long reach brakes that will work fine on the front, for the back you will need a front brake with spacers.
You could just use the steel brakes you have with koolstop pads.
Front racks come up on ebay from time to time.
Hope that is some help