I could fit mudguards to my older MTB and I do have a set of clip on mudguards that I use from time to time, but my new-fangled 2007 carbon hard tail has absolutely no facility for mudguards.
Hate the bloody leather saddles, they are not comfy out the box unless you have a well padded backside and yes they conform to your rear over time but thats just it its the time it takes. Never found them comfy and I've had a couple so my dislike is based on experience plus the metal rail at the rear does not conform ever.
Saddles are always going to be a very personal thing, whatever they're made of. I found both of my leather saddles pretty good out of the box, so I guess the ones I have are roughly the right shape for me to start with.
They are slightly wider at the rear than many of the modern saddles, around 150mm, whereas a lot of modern saddles seem to be only 130mm or so wide, they are also perhaps a little flatter at the back, so perhaps that flat shape with a little extra width is key for me. Also, both my saddles, while being wider at the back, have very scalloped sides, transitioning sharply from the seat part to the nose, whereas modern saddles tend to be more triangular in plan. Perhaps this too has something to do with why I find them more comfortable - who knows, maybe if I found a plastic saddle a fairly similar shape to the Spa Aire, I would find that pretty comfortable.