Congrats on landing your first client! On your setup: keep the HTML dashboard but add an error workflow in n8n (any failed execution emails you the node + error), and export/backup the workflows daily so a lost file or VPS issue doesn't take the client's system down. For the gap filler, a schedule trigger that checks calendar free slots plus a conditional form usually does it without extra tools. Simple beats perfect for client #1, you're on the right track.