I ran through this on Thursday. Looked OK to me as an extension to the "non urban" map. Featureless yes a wee bit but left or right back over the bridges plus running along the path and judging distances "in" could make an interesting addtion to any course.
I agree - it's been there but low on the to-do list for several years. Not quite good enough to bother a real mapper, but maybe if I scare up some Lidar.
It was even nicer before they felled parts of the wood at the eastern end about 10 years ago. The strip of wood at the western end is pretty thin. Still - as you say - if it's easy to get a lidar map, it'd open up some new Dechmont options.
You'd need to use Lidar for the rest of Dechmont as well - its got some structural errors in it and needs revisiting from scratch.
It's not too bad now. I got rid of a few of the 50 m distortions from the old version when I georeferenced it to the urban map. But I expect lidar could be a significant improvement in the hands of someone who knew what they were doing.