Don't waste your time trying to make a lemon juice soap and expect it to smell like lemon. The lye will destroy it. Plus, lemon juice is extremely acidic. I don't know that the soap would work with that.
I soap with a number or liquids, but don't expect the scent of the original liquid to come through. I just use different ones for the properties they bring to the soap, like goat milk, buttermilk, coconut milk, beer, water, teas.
The only way to have a lemon soap smell like lemon is to add a lemon FO or EO. Just know that the EOs don't retain their citrusy goodness for long unless you anchor with something else.