While I do run my own construction crews as well and have done a few full gut renovations, mostly for my own projects but occasionally on projects for others, that size job is probably out of my what I'd take on only because it would tie up my crew(s) too long away from my own projects. 

I’ve been buying from lumber supply and occasionally from Home Depot.

Happens occasionally, but not frequently.

My students tell me the first one crystallizes the concepts and the next two or three make them fairly self-sufficient and independent with occasional calls to me for support.

Other members have reported a lowball offer will occasionally get accepted.You can try direct marketing.

It is the occasional tenants that leave a bad taste and make it hard on the rest.

NO- I read J Scott's blog occasionally but for the most part no.Its really funny I work in the mortgage industry but I never listen to the news.

When investing SD Roth IRA in Tax liens and occasional property is foreclosed on and re-sold for quick profit, will there be any implications with UBIT?

I put a lot of trust in my CPA and occasionally get my taxes reviewed to look for errors and areas to save money on taxes.

But every now and then you'll have something major happen that makes you do much worse than the 50% in occasionally.