@mac48025. You will want to mod the SEs as they will have the better drivers. I can assure you the crossover parts can be upgraded in the SE reflecting more of what I used.
Duelund would not be possible due to the crazy high cost. Remember the cap values are as high as 220uf, 68uf, and 10 or 12uf. Sure in the 1.5 uf cap on the center tweeter. A 12uf Duelund CAST cap costs $1300. A 40uf Duelund cap costs $3300. A custom 68uf and several combined caps to get you to 220uf would cost some $10,000 per speaker! Oh my! If you go this route have a master woodworker make you a great set of new cabs and outboard crossover boxes. Two inch thick front baffle and works!
No worries, great choices beyond Duelund here! On values up to 15uf you can use the wonderful Jupiter copper foil or Jupiter HT Aluminum foil caps in wax. On the large value caps I used Mundorf Evo Oil to make up the 220uf cap. The best sounding large value cap I know of is the Mundorf Supreme Evo Silver & Gold. It is expensive, but nothing like the cost of the Duelund. The stock SEs will not have parts of this quality. Also go with Path Audio resistors. All of these are too big for the cab and will placed externally.
These parts are better sounding than the electroltyics or lower range Clarity film caps used in the stock and SE speakers.