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I do the dykem method and scribe a line into the knife steel and I use a thin plywood about 3mm thick, I have also used 1/32 thick G10 spacer for templates. Just scribe the line into the metal as hard as you can and whether the dykem or sharpie ink burns off, the scribe line is still there. For fine folder liners I would use aluminum for the template about 1.5mm thick and hand file it as perfect as possible as parts have to match up on a folder.
Your wood bandsaw will cut aluminum and brass with a 14TPI blade or finer. I do it with mine no problem, just remember to smear some oil on the top of the part along your line. I'm sure they sell the blades in Ireland, though they might designate them differently like 14 teeth per 25mm. I have used my blade quite a bit, they last long if you use some oil on the parts, don't put it on the blade.
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