I really love both of these ranges and, when I wanted to start my TYW collection, I did look at the possibility of basing it around these figures. Sadly I decided that it wouldn't work. This was mainly because the Swashbucklers are big and I didn't think they would look right next to some other figures I wanted to use - particularly the Foundry Musketeer Characters and some of the Perry ECW figures. Height-wise I imagine they might fit in with Bicorne and Renegade ECW figures but I haven't checked. As to clothing style, I suspect one issue will be which part of the TYW you are interested in. Clothing, weaponry and tactics changed during the 30 years of the war. The ECW rages are (for obvious reasons) more suitable for the later TYW. Also I believe that the later battles of the TYW featured a greater proportion of cavalry, and (although I haven't checked) I don't think either of the Swashbuckler or El Dorado ranges feature cavalry. Having said all of that at the moment I'm having a sculptor convert an El Dorado artilleryman which is in a pose I particularly like into a TYW pikeman and the main changes will be to his shoes, his breeches, his hat and he will need a sword. All in all, quite a lot of work which is feasible for a single figure but enormously time consuming (and therefore enormously expensive if you use a professional sculptor as I do) if you are doing this for a large number of figures. A pity because both the Swashbuckler and the El Dorado ranges are wonderful ranges imho.