Yes I think its possible, although difficult for fine detailed work.
I like the idea of 'Manhattan style' construction. I've never tried
it, but it seems to be popular with radio enthusiasts. No etching
involved! Here is an example (there are many more examples on this
site):
http://www.k8iqy.com/qrprigs/2n230/2n230pictures.htm >
> I got an idea. Can it be possible to make a "PCB" by cutting narrow strips
> from an aluminium ( or even better, copper) adhesive tape and fixing them on
> any non-leading surface, that would be strong enough to make a
> substitude-PCBoard?