Ver 7.1 build complete, tested, demo version shipped. There are no bells and whistles in this version as there was in Ver. 6, making it slightly more difficult to use - hard-copy guide would be a plus - under development. I may revisit this, including the bells and whistles, in updated versions in the future. Also, there are things that Ver. 6 did that weren't, by design, included as a part of Ver 7 - I'll revisit that as well. But the two versions had different requirements and would be aimed at different targets from the start. On the other hand, data entry in Ver 7.1 is and will be slow, as can be expected in a spreadsheet of this size, and any increase in base size will not improve the situation.
Speaking of Ver. 6, after meeting with the client, I've issued a recall. A major mod is needed - it'll be incorporated and returned. Except for the needed mod the client reports performance is satisfactory and output is as expected.
Ver. 8 is now is expected to start out as a road project - something I'll work on while away from home and not involved with anything else.
All is well.