For use in Ireland Option 1 might be a bit exposed. They only describe it as 'water-resistent' not waterproof.
And Option 2? Well loads of people point to that video but I have NEVER seen the finished roof anywhere online. It may be floating about but I've not seen it in loads of research.
It has several 'issues' that put me off in deciding what I'd do to my own 110. The first is that it's barely long enough to sleep in the raised section - by the time you fit seals and canvas, struts etc you'll definitely have less than 72" - if you're only 5' 4'' or so that might be ok, but it wasn't for me.
Then the height - you can only go as high again as the height of the sides unless you devise some form of telescoping nesting support system - yes you can stand in twice the side-height but you'll struggle to get onto the sleeping platform if it's in the raised section. And third, the bar across the back door is something you will forever curse as you whack your head and/or shoulders on it EVERY time you get in or out. Don't underestimate the restriction to entry caused by that apparently simple bar across - you're losing a substantial proportion of your entry area.
Add in the four canvas sides and where they go, the seal required across the roof where the front joins the back, and the other complications raised by preventing water ingress and it becomes less practical for our climate. Ok for desert use though!
I discounted all these options and went for the hinged-at-front lifting roof - which gives good standing room (lengthwise) from the back door to the point where the roof-over-cab slopes down (6' linear), plenty of room to climb up onto the raised sleeping platform and still be able to easily sit upright, with a full 7' of sleeping length, is easier to seal at sides, and easier to mechanically lift via struts using the fixed pivot at front in the form of the hinge.
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