Depending on your tension and how you end your threads, stitching page by page, can create visible ridges that cannot be repaired. Stretching and framing will only make these more noticeable.
My suggestion to avoid these ridges is not to end your stitches along the sides of each page. As you get close to the edge of each page, tape the next page to it and follow each symbol across, or park your threads.
Heaven & Earth also recommends to cross stitch on white 25ct Lugana. There is nothing wrong with this, but by no means is this the only fabric you can stitch a Heaven and Earth design on. Due to the large stitch count of these designs, the finished design size sounds smaller and thus more manageable than cross stitching it on 14, 16 and even 18 count aida. The amount of work is the same, only the finished design sizes vary. In actual fact, I find it easier and faster to stitch on aida than to cross stitch over one fabric thread on 25ct Lugana. Lugana is a woven fabric and if not careful, stitches can slip under at the cross over. Furthermore, cross stitching 1 over 1 on 25ct Lugana does not completely cover the fabric, this is very noticeable with darker thread colours. One way to avoid this is to reduce the contrast, choose a light to medium fabric colour. Another is to cross stitch on 18ct aida. Yes, the design will be larger, but 2 strands of floss give perfect coverage on 18ct aida.
So, my recommendation is to draw from your own knowledge and cross stitch experience. Designers, and that includes yours truly, will make recommendations based on their own preferences and biases, but this does not make it gospel. Just remember..
The only rules to needlework are:
1. The thread must go through the needle.
2. The needle must go through the fabric.
Everything else is only a suggestion.
We stitch because we love it, so enjoy.
We stitch because we love it, so enjoy.