I used to shoot a lot of ranges that had both trad and compound shooters, and the only complaint I had on mixed ranges was that most of the targets were very long range for most trad guys. Since I was the only trad shooter at several places, it took them a little while to get used to my distance limitation, but they accommodated me, and all was well. But there is definitely a different mindset between us and the compounders. That is the only item I would stress regarding the 3D setup. One other thing I noticed when shooting with the compound guys was that they regularly wanted to shoot my stick bow, a perfect chance for a little traditional ambassadorship. Several of them got trad bows themselves.
I like the 48X48 targets for the indoor range.
Where I differ, just a little is on stocking items for sale. After you have been at it a while, you may find it useful to stock a few points, nocks, inserts, etc. so guys can make quickie repairs at the range. I understand you don't want to have a full blown pro shop, so just let experience with your clients guide you. I hope you are very successful. Good luck!