Yeah - sloping top tubes make sense on very small and very large frames for different reasons. On smaller frames it helps keep the headest in the right place while allowing you to stand over the bike. I ride very large bikes and sometimes you have to accept that the bike that fits you might not look as proportional as you'd like.
I think you will find it easier to find rims and tyres for 650c wheels than for 24" by the way.
Yeah - sloping top tubes make sense on very small and very large frames for different reasons. On smaller frames it helps keep the headest in the right place while allowing you to stand over the bike. I ride very large bikes and sometimes you have to accept that the bike that fits you might not look as proportional as you'd like.
I think you will find it easier to find rims and tyres for 650c wheels than for 24" by the way.