The normal joyful IFR equipment discussion
Some other caveats beyond those mentioned:
We are assuming this isn't for an RV-12 type airplane, but if so, LSA's have additional restrictions for IFR flight (as in they can't at all? Can't remember the details, and apparently there is different interpretations, and matters how you are LSA (S-LSA, E-LSA, EAB (but still LSA))
Next, apparently some EAB's had operational limitations specified that limited operations in IMC, but these can be updated by your friendly DAR if that is the case. I think all past and current ops lims referred back to 91.205 anyway, and of course that is the FAR, so you that is the bare minimum needed for equipment.
Lastly, the requirements for Pitot/Static/Altimeter etc checks are actually specified in Part 43, Appendix E and F, so you kind of have to piece together the various FAR's to get a complete picture of what equipment is required, and then how to maintain it. I have heard that there is a common misperception that some of those checks don't apply to experimental, or to VFR airplanes, etc, but I don't see that to be the case, but it's certainly been hotly debated here and other places, so do what you gotta do
Since your at TKI, if your transponder check has expired, there was a thread here recently discussing this. Since your under the bravo, it gets complicated fast since you need it in the ring, but you can't use it legally cause it's expired, but you need it in the ring...
Walt and others in the metroplex have mobile transponder etc check services, if you are unable to (legally) fly it to them, they can come to you.