'further down below' is correct and can be used in written English.
You can use it when referring to something that has already been mentioned and that the reader can find further down (in the text). For example: For more detailed instructions, please see the section further down below.
Further down, below the moor, the laneside verge was bright with lady's-smock, the so-called cuckooflower that blooms when the first cuckoo calls.
This throws up the question to what extent clear demarcations between these manifestations are necessary, a question which is discussed further down below.
On the web, the map and list of recommendations often show up as you scroll a bit further down, below the results for posts from Groups, links, posts from friends, and Facebook Pages.
For more details on the NR population, please see the section 'Response' further down below and Figure 1.
However, wherever grammatical metaphors occur in texts, it makes sense to extend the analysis of rhetorical complexes further down, descending below ranking clauses, so that incongruent patterns of realization can be brought out.
The fact that Task3 and Task4 yielded rather long lists of candidate proteins (>1000 clusters) was not considered a problem, since subsequent filtering and sorting narrowed the list further down (see below).
SFL clubs wanted some of the money going to First Division clubs to filter further down to the levels below, but that was rejected by SPL clubs.
The hillsides yielded shallow-buried gum (about 1 m), but in the swamps and beaches, it was buried much further down (4 m or below).
Further down the front page, below the fold, was the obituary for Christopher Hitchens, a brilliant polemicist and an unwavering supporter of a war he considered effectively over in his June 2003 collection, "A Long Short War".
It is already clear that as long as people continue to use Google as the default engine & Google continues to push organic results further down the page or below the fold then any form of SEO will effectively be obsolete before long.
Below those gauges, further down the center console, is the optional ($774) AM/FM six-disc CD changer by Pioneer that includes six speakers and a Bazooka Tube subwoofer that eats about 1/3 of the available cargo space behind the back seats.
