i extracted the Windows10_TechnicalPreview_x64_EN-GB_10041 with 7_zip. then i replaced the install.wim with the 10014 install.wim. loaded setup and now have Spartan.
why they're still using this ugly font rendering.. I don't know if it's my monitor (lcd) but the text in IE is really weird, now with your screenshot I can see it still looks the same.. like they forgot to enable antialiasing or something... using Chrome or Firefox it's perfect.
And you downgraded yourself to 10014! And that for something which isn't even released as Alpha from MS yet, only used internal at Microsoft!! Had you ever asked yourself: Why Spartan isn't part of build 10041? MS will have some point why not!!