I do already have a HYMM set up and that’s where all of my spare funds go for investing.

You can use a money market account to get higher interest, while making the money less available, without locking it up, and still have it easily available, in an emergency.You are doing well, looking at renting out your spare rooms.

How much time are you going to spare, if any?

This rental property will be designed with a keen focus on generating a healthy cash flow.Project Blueprint:Budget: Allocated at $200,000, covering construction and all related expenses.Focus: To merge energy efficiency, durability, and tenant comfort with cost-effective construction strategies, making the rentals both affordable and sustainable.Location: Currently scouting – I'm open to suggestions and insights on ideal locations supporting this vision.Strategic Planning:Efficient Design & Planning: I'm considering compact, multi-functional layouts to optimize space usage and incorporate cost-saving construction methods without compromising quality.Sustainability & Efficiency: The plan includes investing in top-notch insulation, air sealing, energy-efficient systems, and sustainable materials to reduce the building's carbon footprint and operational costs.Budget Management & Cost-Saving Initiatives: Careful budgeting and exploring value engineering options are crucial, alongside seeking out grants or incentives for energy-efficient building projects.Community & Sustainability Goals: To create shared amenities to foster a community feel and implement systems encouraging tenants to monitor and reduce their energy consumption.Seeking Community Insights on:Cost-Effective Building Strategies: How can I ensure the project remains within budget while achieving high sustainability and efficiency standards?

I keep a spare set handy to just swap it out. 

Yes i can see well enough to see if i got a strike or spare.  

I never recommend selling a house unless you are selling it to invest the money in something that provides a greater return, or you are experiencing financial difficulty and can't get out of it through other means (e.g. a part-time job).Have you considered living in the 5bed house and renting out a couple of the spare rooms?

My background is custom residential, everything from large single family residences to more compact 2-4 unit projects. 50/50 mix between end-user projects and spec homes.

Quote from @Terezija Miskic: I am a newcomer in Airbnb short term rental business, and I am renting out a spare room in my leased apartment (I am not a property owner).

Yes, try to avoid burning/using your money from your savings account unless it's you have extra savings to spare.