if you maintain a healthy respect of electricity in the build you should be fine imho
the hardest aspect of a SS stockpot boiler build is the initial opening or breaking the skin for pilot holes, and a sharp nail or screw and a hammer can be employed for the initial breach leaving an easy job of expanding the hole with a succession of increasing size standard drill bits
with my pride n joy ss pot kit build i sourced brewing elements which earth the pot against the element body by employing a single inner wall silicone seal.
however my #1 boiler was a 50l hdpe blue barrel (ex mango chutney barrel) fitted with kettle elements backed with small �ãshop food boxes which worked a treat. if you cant freecycle an ex mango chutney barrel from a local indian restaurant they were on sale on ebay for �ã11 delivered. they do require a good clean and period airing out to de-whiff
hdpe does soften with boiling temps so to stop the mouth ovaling as a consequence i cut the centre from the lid and used the lid frame to maintain the round mouth.
the copperkettle online brewshop sell more robust PP buckets (euro buckets) 33l and 67l which make great boilers and dont soften like hdpe but do cost a bit more, and iirc they will cut element and drain holes foc, in fact they can sell you everything from elements to drilled out brass compression tank connectors for threading cooper tube into the boiler for hop filter fixing too.. no im not associated with em beyond being a satisfied customer..
fyi
hdpe boiler with 2 x tesco budget kettle elements
a 67l PP bucket hlt
and the 98l stock pot boiler with low watt density 100% SS brewing elements courtesy of MrLard aka the homebrewbuilder Wot deadspace?