Not everyone has the same priorities - some care about interest rates the most, other care about the points the most, getting the most leverage, closing timeline, reputation, smoothness of the transaction, etc. 

I would appreciate any advice on whether it's a good idea to invest in land on a slope and the potential challenges of building on such terrain.If this seems like a worthwhile investment, can anyone recommend reputable construction companies that specialize in cabin builds on slopes? 

I have found no record of him online aside from self-published articles made to make them seem more reputable than they are.  

I hope you are asking two separate unrelated questions, because there's no point in doing cost segregation for properties held inside your self-directed solo 401k, save for some very rare exceptions.Some of the Bigger Pockets experts who operate reputable costs segregation companies are @Bernard Reisz, @Yonah Weiss and @Julio GonzalezSome of the Bigger Pockets experts who offer Solo 401k administrator services are @Dmitriy Fomichenko, again @Bernard Reisz and @Brian EastmanReach out to them and see if they can help.

I do some construction myself and have an extensive team of framers/ electricians/ plumbers / HVAC ect. 

With that said can anyone suggest reputable lenders that are able to assist me with a debt consolidation loan of ~25K?  

I leverage a cleaning service, a few landscapers, handymen, contractors and plumber.

You can look at a mobile home and see it as an easy rental with new carpet, trim and some paint but there are other bigger uglier expenses that can come up.Roof Replacement, soft floors (water damage) in kitchens and bathrooms- most floors are particle board, exterior door replacement (special order), underbelly insulation falling, bad hot water tanks with rotten floor underneath (real joy), bad windows (water again), bad bloated siding (water), water damaged base frame around perimeter of home, cracked tubs (special orders) and frozen pipes (Good luck finding a plumber to come work on a mobile home- they do not exist). 

They either had below mkt. rents or high vacancies and bad reputations and with super managing them I significantly grew the cash flow. 

I know it can depend on factors like the borrower’s credit, payment history, and loan terms, but I’m looking for general guidance or ballpark percentages based on your experience.Top Buyers/Companies:Who do you recommend as reputable buyers for these types of notes?