One question I have to ask though. The specs for cap C6 are 1 uF 50V, the closest I could find at the local electronic store (RadioShack) is 1 uF 35V, I was wondering if there could be a problem of premature failure under stress. I had a C6 at 1 uF 35V on a different board run fine for several years but I wanted to ask.

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I don't know offhand what C6 is connected to, but if it's just a power supply bypass cap, it only needs a voltage rating "sufficiently beyond" the nominal supply voltage. A 50% buffer is fine. So, if it's across a 12V supply, a 20V rating is plenty. If there are spikes large enough to take out the cap, it's curtains for the semiconductors, so that's not a concern.

[A higher voltage rating, by the way, does not always mean greater robustness. If the capacitor is used in a way that ESR is important (an example is C1 in the original compacts), then the heat generated by the dissipation there can matter much more than the risk of dielectric breakdown. It ain't so simple.]