Hi Cats,
Would have to agree with Ubi, the 1675 is tough for a decent rep to even build and a superfranken will end up costing as much as a gen to build. I was never real happy with my modded 1675 (dial was tad too large, CG's not the right shape, GMT hand wrong shape, crystal was glued one etc) and ended up buying a gen 16750, but that was just me! A lot of good deals out there still on emay a VRF if you look carefully and "buy the seller".
Good luck in your quest!
What can be done with a modded rep:
And the real deal (well my transitional 16750):