Some thoughts on an orbital launcher.
Assumptions:

• All stages contribute the same DV (Bad assumption)
• 9500 M/Sec Delta V may not be enough for a really small vehicle.
  
• MR is achieved MR per stage including payload.
• We assume the MR is the same for each stage (again a bad assumption)
  

This table shows you the minimum ISP performance you need given an achieved MR and a number of stages. For Reference the Blue Ball with no payload and no legs had a MR of between 5 and 6. If my notes are correct the Falcon 1 first stage with no Payload and no 2nd stage has a MR of about 16.

MR is down the left side, number of stages is across the top.

	Minimum ISP
Stages	4	3	2	1
MR
2	349.3	465.7	698.6	1397.1
3	220.4	293.8	440.7	881.5
4	174.6	232.9	349.3	698.6
5	150.4	200.6	300.9	601.7
6	135.1	180.2	270.2	540.5
7	124.4	165.9	248.8	497.7
8	116.4	155.2	232.9	465.7
9	110.2	146.9	220.4	440.7
10	105.1	140.2	210.3	420.6
11	101.0	134.6	201.9	403.9
12	97.4	129.9	194.9	389.7
13	94.4	125.9	188.8	377.6
14	91.7	122.3	183.5	366.9
15	89.4	119.2	178.8	357.6
16	87.3	116.4	174.6	349.3
17	85.5	113.9	170.9	341.8
18	83.8	111.7	167.5	335.0
19	82.2	109.6	164.4	328.9
20	80.8	107.8	161.6	323.3
40	65.6	87.5	131.3	262.5

The second chart shows the vehicle gross lift off weight given a 1Kg payload and assuming that the empty stages weigh the same as the payload they are lifting.

		GLOW multiplier
	4	3	2	1
2	256	64	16	4
3	1,296	216	36	6
4	4,096	512	64	8
5	10,000	1,000	100	10
6	20,736	1,728	144	12
7	38,416	2,744	196	14
8	65,536	4,096	256	16
9	104,976	5,832	324	18
10	160,000	8,000	400	20
11	234,256	10,648	484	22
12	331,776	13,824	576	24
13	456,976	17,576	676	26
14	614,656	21,952	784	28
15	810,000	27,000	900	30
16	1,048,576	32,768	1,024	32
17	1,336,336	39,304	1,156	34
18	1,679,616	46,656	1,296	36
19	2,085,136	54,872	1,444	38
20	2,560,000	64,000	1,600	40
40	40,960,000	512,000	6,400	80

The two bold numbers are about where I think my notional vehicle will land on this chart. This was a 1Kg nanosat with 1Kg of support structure would have a gross liftoff mass of ~2200 lbs, and the engine performance is a relatively easy ISP of 232 (Easy in vacuume, a bit harder on the first stage) Total Vehicle empty wt would be between 500 and 600 lbs.

you can do some really gross things... like a monoprop 4 stage launcher... MR 6 Glow for 1Kg payload is 40000 lbs.