I did do Hard Lemonade (with Lime) - It's in my Sig as 'Ey Oop' (Hey Up) - A northern expression of exclaimation/surprise in England.
I named it that as a word play on '7 Up' and "Ey Oop! What's Caplan trying to get us to drink now?"
I did my own version using a little of both the recipes yourself and ScottT put forward - Apologies for using Metric, you can convert it to US Imperial easier (google). Here goes!
Ey Oop - Experimental 4.5 Ltr Recipe (1 UK Gallon)
6 Lemons juiced plus zest (I got 300ml of Juice)
3 Limes juiced plus zest (I got 100ml of Juice)
525Grams Sugar (I used sucrose - It's a lemonade not beer after all....)
Safale 04 Ale yeast
5 Litres of Water
Details - Zests and sugar thrown into a small brew bucket. Add 2 Litres of boiling water, stir to dissolve sugar, then add the juices. Top up with the other 3 litres of cold water. When cool enough add yeast and nutrient.
My O.G. 1041.
I gave it 8 days in primary then secondary (gravity had dropped to 1013) for 30 days! The airlock kept going nicely - it would with fully fermentable sugars so I wasn't concerned.
When it finished bubbling (F.G. 998) i added non fermentable sweetener (Canderel) by taste to counter-act the harsher Citric tones, a little corn sugar for carbonation and bottled it.
Critique - I tried one Last Sunday (2 weeks in bottle)
Taste - it's sharp - Next time I will use use more artificial sweetener to sweeten it when bottling if i do it this way - I'm no fan of artificial ways to sweeten things but I'll see.
It's a little harsh alcohol wise (2 weeks in bottle - what did i expect! ) - a little aging will help - three more weeks i reckon and i'll try another
Carbonation - Not much yet but I've stored it cold so i know It'll happen given time - it's with my beers that do carbonate well in time.
Thanks for your help Pumbaa I'll be doing another!