Are you sure those are t5 and not t8? 24 watt seems familiar to my t8 fixtures at shop. I’m sure there’s multiple options in both though, so could very well be t5. The main reason I ask, is because if it’s indeed a t5 you can possibly bump those bulbs up to the t5 ho. Which would be about 54 Watts a bulb I think. That along with a couple of led panels would probably be a decent start.
On the flip side, there may be some better options out there depending on what would be left in your budget. I’ll be honest, low budgets and larger tents don’t really mix well when building a grow. But perhaps we can find you something that you can continue to build on in the future, without wasting any money up front.