There's nothing to stop you from having a scratchplate as you first envisaged. You could fit a 'standard' one if you had pots and a jack socket with long enough shafts. Alternatively, like my Ibanez RG-08 has, you could cut bigger holes round where the knobs and jack socket go for the knobs to fit through.

Click image for larger version. 

Name:	Ibanez scratchplate.jpg 
Views:	328 
Size:	276.1 KB 
ID:	15123

But by now, your mental picture of what the guitar will look like has probably changed as well. Just a thought.