To answer your question about smoothing caps - no. For an amplifier like this you want at least 10,000uF capacitance PER RAIL, and they must be able to withstand the rail voltage so you'll need 63V capacitors.
Generally, the more capacitance you have, the smoother the voltage and the more energy reserve the amp has which leads to better bass. AS you can see Marcus uses 2x22,000uF per rail, this could be a bit expensive. Check prices on Farnell and you'll see that these sort of high capacity high voltage caps are expensive. As an example 10,000uF 63V capacitors from Panasonic (Farnell part code 652179) are £6.31 each. I would suggest looking on eBay for filter capacitors. I have sent you a private message with a link to an eBay auction you may be interested in.