Advice on active 2/3 way design

I'm planning on building a pair of active 2 or 3 way speakers that have a pretty good LF response in a compact(ish) design. I also want to learn from the design process so I'm prepared to spend a fair bit of time prototyping. I started out looking at a coax/sub arrangement using a SEAS CN16N001/F and L26RO4Y but I'm not entirely confident the HF response of the coax will sound as good as the T35C002 tweeters I'm used to in my A26 mains.
So that got me to looking for a woofer that could work with the T35C005 (other than the A26) which led me to find the W22NX001. So now I'm thinking about using those drivers in a 40L closed box crossed over at 1500Hz. I'm thinking a waveguide might be beneficial for the tweeter and as it will be a closed box I have the option of a Linkwitz transform on the woofer. I can CNC the cabinets so incorporating the waveguide into the baffle should be simple once I've worked out the profile (which I guess will be the difficult bit). Also I plan to prototype the filters using a miniDSP before designing and building them as analogue filters.

So does that sound like a good plan or am I destined for a time consuming, expensive disappointment? Any advice gratefully received.