The Hoops have been one of the most active Premier League clubs this summer as they look to avoid the relegation battle that engulfed them last season.
No fewer than eight players have arrived already and more are on the horizon, with negotiations understood to be under way with the likes of Dawson, Real Madrid's Ricardo Carvalho and Inter Milan goalkeeper Julio Cesar.
Manager Hughes hopes to see some of those at Loftus Road by the end of next week and admits several could be leaving in that period.
"We've had a huge turnover of players I think since [chairman] Tony Fernandes came to the club," the Welshman said.
"I think we've probably allowed 20 or so players to leave. We've been able to add maybe 12 or 13 players of, in my view, better quality.
"That is what we're trying to do - improve the quality of the first XI and ideally the squad that underpins that.
"There is still business to be done. There will, I am sure, be comings and goings but will not be replicated in January and seasons to come.
"This is something we envisage is needed to be done but once we've gone through the process and the squad is settled, then we'll add quality as and when we see fit.
"I'll certainly be comfortable with the squad if we can conclude all the deals we hope to do this window."
Spurs club captain Dawson is one of those targets but Hughes concedes the deal has stalled due to personal terms.
"At the moment it is not where I'd hoped it would be," the Welshman said. "It may change. Obviously we've still got days left until the window closes so it might be revisited, but at the moment it is not in a place we think we can progress.
"There was an issue with personal terms."
Hughes was less forthcoming when asked about moves for previous Champions League winners Carvalho and Cesar.
"There is a lot of speculation about players that we're interested in or supposedly interested," Hughes said.
"Some jumped the gun somewhat in terms of that one (Carvalho), but we're looking at quality players that can enhance the squad.
"Some are available, some are attainable, some are out of reach. We just have to focus on the ones we feel we can conclude."
On the prospect of bringing in Cesar to provide competition for Rob Green, he added: "Well, it was my intention to bring two keepers in because we possibly wanted to give the option to the likes of Brian Murphy to go out on loan somewhere.
"We're still looking. We haven't been able to do that as yet and that was certainly the intention at the start of the season."
One player that looks set for the exit door is former captain Joey Barton.
The midfielder is in the midst of a 12-match ban for his conduct against Manchester City on the final day of last season and could be set for a move to France with Marseille.
"I think I mentioned that Marseille had expressed some interest but it hadn't really developed in terms of emails being exchanged and so forth," Hughes said.
"I think it is a little bit further down the road. It still might be a possibility but I haven't had an update in the last couple of days so I am not quite sure where we are with that."
After QPR's 5-0 home thrashing by Swansea, Hughes' immediate focus will be on making amends on Saturday at Norwich - a side that lost by the same scoreline in their opening game.
"We have worked exceptionally hard this week and there has been a good response," he said.
"Obviously we're disappointed ourselves and we disappointed our fans on the day.
"From our point of view, we've just got to really focus on the Norwich game and start our season at the weekend because we were caught in the traps against Swansea."