We're planning on doing a 1031/121 combo.

For example, I've seen where a hobbyist investor/developer works on project, they hire an engineer and/or architect, but they ended up missing something vital, i.e. drainage issues, environmental, fire dept review, planning the wrong type of product for that market (buyer & renter demographic), etc.

We plan to keep the property forever.

What is your plan for using your license?

I work with a retired man would can draw plans for houses and used to build houses. 

CPAs, while essential for tax optimization and financial oversight, may not always be viewed as indispensable in the initial planning phase.Communication Gaps: There may be communication gaps or misunderstandings about the roles and contributions of CPAs versus attorneys and GPs.

I plan to live on the property and eventually sell (it's vacant with no squatters).

If you don't have experience, you'll have a hard time getting financing on something like this as your first property because lenders will want you to have experience, especially if you don't plan to hire professional management.

Echoing what Nathan said-make sure you compare the scope of work both are planning on doing and vet your person.

I'm planning to reach out to a host of a comparable MTR unit in Ontario Ranch, CA.