I did some more thinking and compared the options of my tailed delta and more conventional tailless deltas like the FT delta, super simple delta, even my Avro Vulcan prop in slot, etc. Even with tailless deltas, there's always some variety of handling differences from plane to plane, such as my Vulcan, which is a big wide delta and the new slender delta I made recently. They are both tailless deltas, but handle very differently because of their aspect ratios and other stuff like prop placement and stabilizer style.
The most familiar thing the Vulcan(or a similar big wide delta) would feel like to you is a floatier version of your KFM wing. The banks, rolls, and loops would feel and look very similar, but the plane would overall handle light and floaty and do a bit of high alpha possibly where the KFM is a bit heavier less floaty. The slender delta can roll faster than anything, like a drill bit, and has great top speed, but is generally less maneuverable than some of the other deltas, the banks are a little more long and graceful unless you really get the technique to snap it tighter. The slender delta has latent potential for extreme high alpha and some good slow flight, but it needs an overpowered motor-my 15/30" on 1806 loops and rolls and flies great, but doesn't really slow fly or high alpha like the old V Sliver did, telling me it really wants a 2205 or something similar. This is a kind of specialized plane for shorter flights on a bigger motor and aggressive prop but lighter battery. It's not a very good all-arounder, but super fun. Not something I'd just push on somebody to build with no clue of what they are getting into.
Despite differences from plane to plane, here's things that you can generally expect of deltas; big speed envelope from really slow to extremely fast, generally hard if not impossible to stall(and gentle when they do) and good at full vert, most are capable of very good high alpha and feel floaty on slow flight if you got a low wing loading. Most deltas are such a no-brainer and gentle when it comes to landing it's ridiculous. So will the Arrowhead give you this? Yes, I'd say it has all those characteristics that would give it a true delta feel, including the high alpha. This is not going to just feel like any other AET sportster, the delta attributes will be pretty dominant, but enhanced by the tail plane in ways that give it some really well-rounded and unique qualities. The turns and loops are so snappy, and the stability on every axis is just rock solid for only a 20" wing span. This can do rolls that are pretty rapid and extremely axial, definitely delta style.
So come build one with me and @Grifflyer(making sure it's the new version with the twin tails and all the sciencey stuff that made it better, not the short coupled old one that stalls bad!). All the dimensions are listed, it's all angles, easy to just draw up with a straight edge, or mock up on your software, if that is your approach. The length of the fuselage and length between the wing and tail plane are listed, but there's no set style of fuselage or small exact measurements for that part like there is for all the rest, that part will be all you
. I used a simple A-fold box that's somewhat skeletal and open at the back.
@Grifflyer used an arrow shaft-light, strong, and totally fitting. You can do it any way you want, from a nube tube or any other kind of A or B fold box, to a stick or spar of some kind, to whatever style you want. Me and Grifflyer have already had a lot of success with ours, so we can help you with any issues and make sure yours flies great! I definitely wouldn't recommend my own design if I thought it was junk or you wouldn't like it, and you have our experience with it to help ensure you get the most out of yours.