rental uninhabitable after fire, 4684, 4797, & 4562 questions

I received insurance payout for total loss of rental due to fire and is accounted for on 4684.  Nothing will be done during the tax year regarding disposal or sale.  I received 'loss of income' insurance payout which I will include on Sked E as rental income.  Regarding the payout for the building:

4684 has FMV questions.  Does the FMV exclude the land value?  I presume it does.  Is it correct that fmv after loss is zero, even though I still possess the burnedout structure and land? 

 

The building & improvements, except roof, are fully depreciated.  The roof is the only item still being depreciated (5 yrs remaining).  On 4684 I am using the total depreciable basis from the Depreciation Report as a single entry rather than breaking out each asset as a separate entry since the building is considered a total loss.  Is this correct?

 

When working through "Casualties & Thefts" the annual depreciation of roof is carried over on the Depreciation Report.  Shouldn't it revert to zero as a loss?  If so, how do I do that?  

 

The asset entry worksheet for every asset, excluding the roof, show a disposition date of the fire with blank data for sales price, this seems correct to me but the roof is handled differently by TTax and creates a 4797 entry which I believe is not correct because the form sez "other than casualty or theft".  I cannot figure out what I have done incorrectly that TTax created that entry.

 

Would appreciate some feedback so I can get this sorted out.