Vintage Peugeot conversion help and tips please

If ^ that ^ is the frame your getting... Then this >>>

From your picture it looks like you have plenty of room to tension the chain, my conversion has dropouts about 1 inch long and i've never had a problem. If the ratio you have doesn't fit, get a bigger/smaller cog, there's no such thing as a magic ratio for sliding dropouts.

you ungrateful quent