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The major issue with this is the amount of space that you would require in order to transport those supplies there, but also setting them up in a perfect state where they would float over Venus perfectly and without any major issues.
And not to mention, if we were to actually use these, you would have alot of trouble maintaining them in the case of any structural damage on these 'ships, it's not ideal and can cause alot of casualties in the specific case that something will go wrong.
Even if you attempt to argue that they would float, which they probably would, there would be no effective way to send supplies over there, unless you are implying that we have Star Wars spaceships that can accurately land in or hover near the ships near surface Venus without falling into Venus itself, therefore causing something that you should be trying your best to avoid, CASUALTIES.
Heading to Mars is a guaranteed success with enough time and manpower, not to mention that the possibility of suffering casualties is reduced by an incredibly large amount, therefore making it safer to use Mars as an actual space colony, rather than Venus, which is hazardous.
This isn't a threat to you or your allies, it's a mere suggestion that your 'Venus' mission is not the brightest idea and that Mars is better.