I have several construction crews that do work for another investors too. 

Goodmorning Johana,Best bet is we refinance the note and see what kind of terms we can get going on this.Typically can close fairly quickly here in texas using hard money notes.

Hello BP STR experts, If I buy land first for constructing/manufacturing home, can I then claim bonus depreciation for such a constructed/manufactured home and use that calculated depreciation amount to offset my W2? 

Purchase price: $140,000 Single family new construction home, 3 bed/2 bath, located in Enterprise, Alabama.

I have a neighbor across the street who is licensed and does general construction and fine carpentry and another neighbor from a different place who is an architect (not sure if licensed or not).

Which is true - but the refi is going to cost you $3,000-$5,000 in closing costs again - which actually moves you backwards by a couple of years to recoup those costs at the $200 more per month you will make once rates get back down to 5.x%.My bet is that unless you can find some seriously undervalued real estate that your numbers won't look pretty at 8% interest (all in).  

You can probably do it in areas without zoning or farmland, but it is very difficult in a traditional residential zone.Your best bet is to look for areas along busier roads that are currently residential and turning commercial or already turned commercial with lingering residential.

My loan rate on an investment property is 3.5% and after construction there is a significant equity, which I prefer to use for HELOC.

If you're using all cash then obviously that's not an issue.Another thing to consider is if the land has deed restrictions, checking on the city website or MLS would be your best bet there.I'd love to learn more about what you're trying to do and maybe be able to help answer any questions you might have!

I am new to real estate investing and was looking into taking a heloc on my primary to purchase land and do a construction loan.