Francisco. If you use the prespex hatch idea, no more difficult than any other boat.
If building something slightly more modern and all in matt black.. dead easy.
The Hull on mine is a simple three sided box, the top is one piece..an hours carving and sanding balsa will get you the top finished. An hour cutting and drilling the perspex top and setting the screws in their holes.
Finishing off..sanding sealer, greay household undercoat, Humbrol matt black on top.
Completed. No to very little detailing, a bit of a fiddle first time round at the pond to get the bllast right, but then it is plain sailing.
Ashley