A link to Musashi's YouTube channel is here: https://www.youtube.com/channel/UChmDkzf-7Qjw7bJyPVNJ6UQ
Tony Aguilar also has his own YouTube channel with some helpful DBA videos as well, one where he shows some the terrain he has made. Here is a link to his channel: https://www.youtube.com/channel/UCbRAe5rGG3lYIHXFgkrC3wQ