Typically what I do, is explain the Crux of the matter right below the sales comparison grid. For example....
"An extensive search was made to find newer construction sales like that of the subject in the subject's immediate market area of ( your neighborhood name). The appraiser searched one year back, 25% difference in GLA however, no newer construction sales similar to that of the subject were found. Therefore, the appraiser expanded the search to 5 miles out to alternative, competitive areas of (name of those areas). Please see addendum for analysis of sales comparison of the comparables utilized in this report which were the best available as of the effective date of this report.
Now you've set the client up for what they're in store for reading your report.
You're going to have to do a separate market analysis, a 1004MC for example, of similar construction, GLA, bedroom bathroom count, Etc.) for each neighborhood section you utilized comps from in the report to dechiper location and market adjustment differences. A lot of data downloading from your MLS for sure.
Be sure to use a sale or two from the subject's immediate neighborhood, even though they're not newer construction and adjust them up in condition derived from the new construction comps from 5 miles out, and going back in time and finding new construction sales in comparison to older construction sales in the immediate neighborhood.
In other words, you have to dig for data and explain. Make sure to keep everything in your work file you used for your analysis.