Partnership may also be an option-investors added to the deed or partnership agreement/LLC/Corp/land trust/etc. work with an attorney and cpa.

I am looking for suggestions on how this deal should be structured in terms on a partnership, how that works, and if its possible to go through someone else's LLC? 

Most LLCs are taxed as a sole proprietorship or partnership, but LLCs can also choose S corporation or C corporation taxation.Without an LLC or other business entity, your personal assets are at risk if your business is sued for something a co-owner or employee does.It is a good idea to start using an LLC when any of the following occurs.You want to buy residential properties with cash and you do not intend to refinance down the road.You want to buy residential properties using cash but not all of it is your cash.

This makes you passive and makes the income passive, which allows it to be used to offset your suspended passive losses.You can invest in an LLC, a partnership, S-Corp, or sole proprietorship.

I have some questions related to structuring the partnership for anyone who has experience doing this.

Or full-on partnership in everything I do in REI, I guess. 

I did not know how to build relationships to get the answers/help/partnerships i needed.Next tier, creativity with producing equity for deals.

That would be a strategic partnership where you didn't have to pay for marketing and you didn't have to do all the calls yourself either. 

Sure.Owner financing, Subject To, Wrap, Land Contract, (since you are in Texas Not "Lease Option"), Owner carry back, Joint partnership with the seller, VA loans.

Why not just take your 3 SDIRAs and each of invest DIRECTLY with them into a partnership/LLC?